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Smoke from indoor cooking can pose a serious health risk. Pexels Air pollution continues to be one of the most serious—and often invisible—threats to human health worldwide, says the State of Global Air Report 2025: A Report on Air Pollution and Its Role in the World’s Leading Causes of Death. The State of Global Air (SoGA) report is widely considered one of the most reliable and authoritative sources of air quality data in the world. The SoGA 2025 report, published by the Health Effects Institute and the Institute for Health Metrics and Evaluation’s Global Burden of Disease project, says polluted air is not just an environmental issue—it is a major driver of chronic disease, premature death, and reduced quality of life across the globe. Drawing on 2023 data, the report highlights how exposure to fine particulate matter (PM₂.₅), ozone, and nitrogen dioxide affects billions of people daily. There is progress: Between 2013 and 2023, 13 countries reduced their average ambient levels of fine particulate matter, while seven countries saw increases. Regarding average annual exposure to nitrogen dioxide between 2013 and 2023, 11 countries improved while nine countries saw increases. However, globally, the average exposure to ambient ozone pollution has increased steadily since 1990, the report says, adding that “the largest health burdens” are seen in low- and middle-income countries.” Key Data Points Almost 8 million deaths in 2023 were linked to air pollution—roughly 1 in every 8 deaths worldwide, making it one of the leading global risk factors for mortality. Eighty-six percent of those deaths (6.8 million) were caused by noncommunicable diseases (NCDs) such as heart disease, stroke, diabetes, lung disease, and dementia. Air pollution contributed to 232 million years of healthy life lost globally, reflecting long-term illness and disability—not just early death. Ninety-five percent of air pollution–related deaths among adults over age 60 are tied to chronic diseases, underscoring pollution’s role in aging-related health decline. More than 625,000 deaths in 2023 were linked specifically to dementia associated with air pollution; dementia is a newly added category in this year’s report. Thirty-six percent of the global population is exposed to PM₂.₅ levels above even the least strict international guideline (35 μg/m³). Nearly 2.6 billion people (about one-third of humanity) are still exposed to household air pollution from burning solid fuels like wood, charcoal, and dung for cooking. Ambient PM₂.₅ alone accounts for about 4.9 million deaths, making it the single largest air pollution risk factor. Low- and middle-income countries bear the greatest burden, accounting for roughly 90% of air pollution deaths, due to higher exposure and fewer health protections. Why It Matters Air pollution is no longer just about smoggy skies—it is deeply intertwined with the global rise of chronic diseases. The report makes clear that tackling air pollution could significantly reduce rates of heart disease, diabetes, dementia, and other major illnesses. At the same time, solutions are well known: cleaner energy, improved cooking technologies, stricter emissions standards, and better urban planning. The challenge is scaling these solutions quickly and equitably—especially in regions where the health stakes are highest. Sources: State of Global Air Report 2025 https://www.healthdata.org/news-events/newsroom/news-releases/new-report-shows-nearly-9-10-global-air-pollution-deaths-are https://www.healtheffects.org/announcements/new-state-global-air-2025-report-shows-nearly-nine-ten-global-air-pollution-deaths-are

Booming Demand Seen in Food, Pharmaceutical, Textile Industries Traditional seaweed farming in Bali, Indonesia. istock Seaweed aquaculture—the farming of marine macroalgae such as kelp, nori, and wakame—is increasingly viewed as one of the most environmentally sustainable forms of food production, according to government and market analysts. Seaweed grows entirely in seawater and relies on sunlight and naturally dissolved nutrients, meaning it requires no freshwater irrigation, fertilizers, or pesticides. As seaweed grows, it absorbs carbon dioxide and excess nutrients from the surrounding ocean, helping improve water quality and support marine ecosystems. Meanwhile, global demand for seaweed products—from food and animal feed to fertilizers, cosmetics, pharmaceuticals, textiles, and biomaterials—is expanding rapidly, says the US National Oceanic and Atmospheric Administration (NOAA). Market analyses from Cognitive Market Research and The Business Research Company suggest the seaweed sector could become a major component of the emerging “blue economy,” combining environmental benefits with significant economic growth potential. Key Environmental and Market Data Points Every year, about 35 million metric tons of seaweed are produced globally, making seaweed one of the largest sectors of aquaculture worldwide. The global seaweed cultivation market was valued at approximately $19.29 billion in 2024. The sector is projected to expand at a 10.34% compound annual growth rate (CAGR) between 2024 and 2031. North America accounted for a tiny slice—about 4.05%—of the global seaweed cultivation market in 2024. This indicates significant room for expansion of seaweed farming along US and Canadian coastlines. The global commercial seaweed market reached approximately $24.47 billion in 2025, It is expected to grow to reach $43.1 billion by 2030, reflecting strong growth across food, agriculture, and industrial uses. The commercial seaweed sector is projected to grow at roughly 12% compound annual growth annually through the decade. Seaweed aquaculture requires no freshwater because seaweed grows directly in seawater. It also requires no pesticides or synthetic fertilizers since macroalgae absorb nutrients already dissolved in seawater. Seaweed absorbs two major nutrient pollutants—nitrogen and phosphorus—from coastal waters, helping reduce eutrophication and harmful algal blooms. Growing seaweed absorbs carbon dioxide and releases oxygen through photosynthesis, helping support marine ecosystem health. Seaweed can be grown alongside shellfish or finfish in integrated multitrophic aquaculture systems, where it absorbs excess nutrients produced by other farmed species. Aerial view of a contemporary South Korean seaweed farm. istock Sources: NOAA Fisheries – Seaweed Aquaculture (https://www.fisheries.noaa.gov/national/aquaculture/seaweed-aquaculture) The Business Research Company – Commercial Seaweed Global Market Report (https://www.thebusinessresearchcompany.com/report/commercial-seaweed-global-market-report) Cognitive Market Research – Seaweed Cultivation Market Report (https://www.cognitivemarketresearch.com/seaweed-cultivation-market-report

Watchdog Institute Says More Territory Covered, But Results Weak Coral at low tide. Pexels In January 2021, the United Nations designated the next 10 years as the “ocean decade.” A key goal is for nations to work together to protect the well-being and biodiversity of 30% of marine, coastal, terrestrial and inland water areas by 2030, a plan known as “30 x 30.” An ocean protection advocacy group has recently released a midway report that finds global marine protections are increasing, but they may not be delivering meaningful conservation benefits.   New assessments highlighted by the Marine Conservation Institute (MCI) suggest that the world is still far from achieving not just the quantity, but the quality, of activities needed to safeguard marine biodiversity. Key Data Points New global assessments now cover 43,830,000 km² of ocean, representing 12.1% of the global ocean (including proposed protected areas). According to the MCI’s Marine Protection Atlas, 9.6% of the ocean is currently designated as protected. When stricter criteria are applied, just 3.2% of the global ocean is considered fully or highly protected—meaning it is effectively managed for biodiversity conservation. According to MCI, about 27% more of global ocean areas need to be effectively protected over the next five years to achieve “30 x 30” targets. Approximately one-quarter of reported marine protected areas (MPAs) exist largely on paper and are not yet implemented in practice. About one-third of MPAs permit high-impact activities such as bottom trawling and dredging, which undermine conservation goals. The analysis underpinning these findings assessed over 90% of the world’s marine protected area coverage, offering one of the most comprehensive evaluations to date. Why It Matters The “30 x 30” goal is part of the Kunming-Montreal Global Biodiversity Framework. A seventh national progress report was due in February, and 125 countries filed reports. The ultimate goals are to ensure that by 2050, “the shared vision of living in harmony with nature is fulfilled,” according to the UN’s Convention on Biological Diversity. Source: Marine Conservation Institute

Could Be a Boon for 2 Billion People Where Water Is Scarce or Unsafe For people in regions that are arid or where clean drinking water is hard to find, whether through pollution, parasite contamination, or disaster, the new technology could be a lifesaver. Pixabay In a breakthrough that could redefine water security for the world’s most arid regions, Prof. Omar Yaghi—one of three 2025 Nobel Prize winners in Chemistry—has unveiled a revolutionary machine. It is capable, depending on the size at which it’s constructed, of extracting up to 1,000 liters of clean drinking water daily from the atmosphere. Unlike traditional dehumidifiers that fail in dry climates, this device operates in humidity levels as low as 20%, making it a potential lifeline for the 2 billion people globally who currently lack access to safe or sufficient water. The heart of his innovation lies in metal–organic frameworks (MOFs), a class of synthetic, porous materials Yaghi pioneered, building on the work of the two other 2025 Nobel chemistry laureates, Richard Robson and Susumu Kitagawa, whose earlier studies of coordination networks and porous polymers made the new field possible. MOFs act as “molecular sponges” through an internal surface area so vast that if the internal area of a single gram were stretched out it would cover a football field. By “reimagining matter” and then engineering the “chemical stickiness” of these pores and tunnels, Yaghi created a material that specifically attracts water molecules while ignoring other gases. The process is remarkably efficient and off-grid. During the night, the MOF granules absorb moisture from the air. When the sun rises, ambient solar heat triggers the release of the trapped water, which then condenses into liquid. During successful field tests in California’s Death Valley, the machine proved it could reliably produce water in one of the hottest, driest places on Earth. The Plight of the Water-Deprived In his Nobel Prize banquet speech, Yaghi, age 61, reflected on the personal drive motivating his work. He recalled how he grew up in a refugee camp in Jordan, without running water or electricity, where he and his family had to wait for government-delivered water every week or two. “I remember the whisper through our neighborhood—‘the water is coming’—and the urgency as I rushed to fill every container I could find before the flow stopped,” said Yaghi, a chemistry professor at the University of California at Berkeley. The technology, commercialized through Yaghi’s company Atoco, is being deployed in shipping-container–sized units. These are particularly vital for anywhere prone to hurricanes, earthquakes, and other natural disasters that often destroy centralized water infrastructure or maroon communities entirely. Such units could also be a lifeline for areas that are arid or drought-stricken. Because the machine requires no external power or brine-producing desalination, it offers a sustainable “personalized water” future where households or villages can be entirely self-sufficient. Discussing the broader impact of this new MOF science, Yaghi emphasized the environmental stakes: “The key development here is that it operates at low humidity, because that is what it is in arid regions of the world.” As climate change intensifies droughts and storms, the ability to pull water from “thin air” without taxing the environment marks a monumental shift. Yaghi added that, by scaling this technology, the world could eventually become one where access to water can no longer be threatened by infrastructure failure or political or ethnic conflict, because it can be harvested directly from the sky.

World Meteorological Organization Set to Release 2026 Assessment A group of Adelie penguins on an iceberg in Antarctica. Far above their heads, the ozone hole is shrinking. Jason Auch/Wikipedia In late 2025. scientists at the US atmosphere-monitoring agencies reported that the year’s Antarctic ozone hole was the fifth smallest since 1992, the year the Montreal Protocol’s phase-out of ozone-depleting substances (ODSs) began to take effect. Now the World Meteorological Organization (WMO) is preparing to release its next comprehensive Scientific Assessment of Ozone Depletion later this year. This evaluation, coauthored every four years by hundreds of international experts and supported by the UN Environment Programme, will provide the most definitive look yet at the ozone layer’s path toward a full midcentury recovery. A ‘Healing’ in the Skies The success of the Montreal Protocol and its Kigali Amendment—which targets climate-warming hydrofluorocarbons (HFCs)—remains a beacon of environmental hope. By phasing out over 99% of controlled ODSs, the treaty is projected to avoid up to 0.5°C of global warming by 2100. “Today, the ozone layer is healing,” said UN Environment Programme Executive Director Inger Andersen. “Ozone-depleting substances have now been virtually eradicated and the hole in the ozone layer is closing. That is multilateralism at its very, very best.” The Road to 2040 and Beyond Based on current recovery rates, the ozone layer is projected to return to 1980 levels—prior to the appearance of the significant “hole”—according to the following timeline: 2040 for the majority of the world 2045 over the Arctic 2066 over Antarctica. “As predicted, we're seeing ozone holes trending smaller in area than they were in the early 2000s,” noted Paul Newman, a senior scientist at NASA’s Goddard Space Flight Center. “They're forming later in the season and breaking up earlier.” Challenges for 2026 and Beyond The 2026 Assessment is slated for release in late 2026 and will not only celebrate progress but address emerging threats. Key concerns include the planned termination of NASA’s Aura mission, a satellite critical for monitoring atmospheric chemistry since 2004. Experts warn that losing such high-vertical-resolution data could impact long-term monitoring. Further, the report will evaluate the potential ozone-thinning risks of "stratospheric aerosol injection"—a geoengineering technique proposed to cool the planet—and the need for stronger ground networks to detect illegal chemical emissions.

Easy to grow and harvest, bamboo forests produce much more biomass per hectare than traditional timber forests. Simon Joseph/Unsplash Scientists have developed a new bamboo-based bioplastic that not only rivals conventional petroleum plastics in strength and durability but can also biodegrade in soil within just 50 days. The study, by Haipeng Yu and colleagues and published in Nature Communications, represents an advance that could reshape some areas of the global plastics industry. The material, often referred to as bamboo molecular plastic or BM-plastic, is made by dissolving and breaking down bamboo cellulose using a nontoxic biodegradable solvent and then chemically reassembling the component cellulose parts with the help of an ethanol solvent. The result is a dense, high-performance material that behaves much like traditional plastic—but without its long-term environmental costs. In laboratory testing, the bamboo bioplastic demonstrated mechanical strength and thermal stability comparable to, and in some cases exceeding, widely used plastics such as polylactic acid (PLA) and high-impact polystyrene. Scientists reported tensile strengths exceeding 100 megapascals (comparable to the strength of medium-carbon steel or high-strength aluminum alloys used in automotive and aerospace applications) and high resistance to heat and stress. Crucially, unlike most conventional plastics—which can persist in the environment for centuries—the new material fully decomposes in soil in under two months. As noted in a research summary by the Springer Nature publishing company, the plastic “can biodegrade in soil within 50 days,” offering a dramatically shorter life cycle. Bioplastic Outperforms the Regular Kind Researchers emphasize that the material does not sacrifice performance for sustainability. In fact, the study found that “the BM-plastic outperforms most commercial plastics and bioplastics” while maintaining rapid biodegradability and recyclability. The innovation addresses a major limitation that has long hindered biodegradable plastics: strength. Many earlier plant-based plastics lacked the durability needed for real-world use, particularly in infrastructure or manufacturing. By contrast, the bamboo-derived plastic can be molded, machined, and processed using existing industrial techniques, increasing its potential for widespread adoption. The environmental stakes are high. Global plastic pollution continues to grow, with millions of tons of plastic waste entering oceans and landfills each year. Traditional plastics, derived from fossil fuels, not only resist decomposition but also fragment into microplastics and nanoplastics that infiltrate ecosystems and human bodies. Bamboo Boon Bamboo is a fast-growing, renewable “grassy tree” that can be harvested annually and produces significantly more biomass than timber, which requires 10–50 years to come to harvestability. Beyond biodegradability, the new bamboo plastic is also recyclable, retaining up to 90% of its original strength after processing—an important feature for circular manufacturing systems. This dual capability—recyclability followed by rapid biodegradation—could significantly reduce long-term waste accumulation. Experts say scalability will determine the technology’s ultimate impact. Early analyses suggest the material could be produced at costs competitive with conventional plastics, particularly as demand for sustainable materials grows and regulations tighten around single-use plastics. If successfully commercialized, bamboo bioplastics could find applications in everything from packaging and consumer goods to automotive and construction materials—industries currently dominated by fossil-based plastics. While further testing and industrial scaling are still underway, the breakthrough signals a promising shift toward materials that align performance with environmental responsibility. In the global effort to curb plastic pollution, bamboo may prove to be one of nature’s most powerful allies.

Researchers Use AI to Measure Global Growth in Marine Macroalgae Algae blooms on coastal rocks—Spain. Pexels A groundbreaking global study, led by researchers at the University of South Florida, NOAA, Columbia University. and other institutions, is revealing that algae blooms—long considered a localized or seasonal phenomenon—are now expanding across vast stretches of the world’s oceans. By applying artificial intelligence (AI) to decades of satellite imagery, scientists have, for the first time, mapped the scale, speed, and distribution of floating algae worldwide.   As the US National Oceanic and Atmospheric Administration notes, algae are a vital part of marine food webs, but sometimes they become problematic: Scientists now monitor algae blooms for impacts on ocean chemistry as well as localized problems for human health, fisheries, and tourism.   The new findings, published in Nature Communications and highlighted by researchers at Columbia University’s Lamont-Doherty Earth Observatory, suggest that warming oceans, shifting currents, and nutrient pollution are fueling a significant increase in both microscopic and large floating algae.   Key Data Points Researchers used AI and machine learning to analyze approximately 1.2 million satellite images spanning 2003–2022, enabling the first comprehensive global map of floating algae blooms. Floating algae blooms now occupy a cumulative area of about 43.8 million square kilometers (16.9 million square miles), highlighting their massive global footprint. Large algae (such as seaweed) are expanding rapidly in key regions like the tropical Atlantic and western Pacific at a rate of 13.4% annually since 2003. Smaller algae (phytoplankton surface scums) are also growing, though more slowly, at about 1.0% per year globally. In areas like the Indian Ocean, floating algae blooms have tripled, signaling rapid regional intensification. The most dramatic expansion in algae biomass occurred after 2008. This suggests a connection to warming oceans. Scientists warn the ocean may be shifting from a “macroalgae-poor” to “macroalgae-rich” system, fundamentally altering marine ecosystems. Advanced deep-learning models can now identify algae that occupy less than 1% of a satellite image pixel, dramatically improving detection accuracy. Both micro- and macroalgae blooms have shown statistically significant growth over 20 years, indicating a sustained global trend rather than short-term variability.   Why It Matters Ocean warming and nutrient runoff are key drivers of bloom expansion. While offshore algae can support marine life, coastal accumulation can harm fisheries, tourism, and human health. Expanding blooms may alter carbon cycling, oxygen levels, and ocean chemistry at a global scale.   Sources: https://lamont.columbia.edu/news/harnessing-ai-scientists-discover-rise-floating-algae-across-global-ocean https://www.nature.com/articles/s41467-025-66822-5 https://phys.org/news/2026-01-ai-reveal-global-surge-algae.html https://www.noaa.gov/what-is-harmful-algal-bloom

What Animal Bonds Reveal about Consciousness and Emotion By Dirk Anthonis* A duck befriends a capybara, which is said to be one of the most amiable animals on Earth. Pierre Aden/iStock Stories of unlikely animal friendships—an elephant playing with a dog, a gorilla nurturing a kitten, or birds of different species grooming one another—have long fascinated people. Once dismissed as anthropomorphic storytelling, many such interactions are now attracting serious scientific attention. Behavioral studies increasingly suggest that animals can form stable social relationships not only with members of their own species but sometimes with entirely different species, including natural predators or animals with very different communication systems. These findings, and hundreds like them, are quietly reshaping how scientists, ethicists, and ordinary animal lovers think about the inner lives of other species. The animal kingdom, it turns out, is full of friendships—some born of survival, others of something harder to name. Researchers are increasingly interested in what these interactions might reveal about the emotional and cognitive lives of animals. Laboratory and field experiments show that many species—ranging from chimpanzees and elephants to parrots and wolves—can cooperate toward shared goals and may understand when a partner, even of another species, is needed for success. Meanwhile, studies of empathy in animals, from rodents freeing trapped companions to hens showing stress when their chicks suffer, suggest that emotional responsiveness is not uniquely human. “To endow animals with human emotions has long been a scientific taboo. But if we do not, we risk missing something fundamental, about both animals and us.” “To endow animals with human emotions has long been a scientific taboo,” said the late primatologist and ethologist Frans de Waal. “But if we do not, we risk missing something fundamental, about both animals and us.” If animals are capable of forming friendships across species boundaries, the implications are profound. Such relationships challenge traditional assumptions that animal behavior is driven solely by instinct or self-interest. Instead, they may point toward more complex forms of social awareness, emotional sensitivity, and perhaps even rudimentary moral behavior. Two Kinds of Connection Scientists generally describe interspecies relationships in two broad categories. The first is mutualism: ecological partnerships where both animals gain a clear, practical benefit. The second is something warmer and harder to quantify—genuine social bonds, the kind that look, at least from a distance, a lot like friendship. Author and lecturer Jenn Savedge compiled a list of 10 examples of where animals of different species cooperated in the wild. Her examples of mutualism include coyotes and badgers hunting ground squirrels together, each compensating for what the other lacks—the badger digs, the coyote waits above ground. Pistol shrimp, nearly blind, share burrows with gobies, who have excellent eyesight; the goby keeps watch while the shrimp tidies the home. Zebras and ostriches travel in loose companionship; the zebra’s sharp eyes are paired with the ostrich’s keen sense of smell, and each animal is safer because of the other’s presence. These are ancient arrangements, shaped by millions of years of pressure and practicality. Smaller animals, like cleaner fish, cattle egrets, and red-billed oxpeckers, remove parasites from larger “clients” like sharks, water buffaloes, and rhinos. The smaller animal gets a meal, and the larger one gets pest control.  Best friends forever? Muddy Toes Farm LLC/Unsplash But then there are the other kinds of bonds, the ones that lack a clear survival necessity. They are more frequently documented in captivity or human-controlled environments (like zoos) rather than the wild. Cooperative bonds are almost exclusively found among social species with deep-seated instincts for group interaction. Success often depends on whether different species can interpret each other’s alarm calls or body language. There are numerous recorded cases of one species adopting an orphan from another, such as chimpanzees raising tiger cubs, a fawn curled up beside a golden retriever, or a capuchin monkey that has, seemingly against all biological logic, adopted a marmoset as family. This video shows some remarkable interspecies friendships. What Cross-Species Friendship Looks Like Interspecies social bonds are most frequently observed among mammals, particularly domesticated animals and primates, which often form companionship, play, or grooming relationships. Frequent pairs include dogs and cats, dogs and other species (like deer or pigs), horses and goats, and young, orphaned animals that form surrogate family bonds. Empathy may be at the root of these pairings. One animal may take another under its wing, so to speak, “to relieve its pain, hunger, or loneliness,” said Jenny Holland, who wrote the 2011 book Unlikely Friendships, in an interview with National Geographic. “Mammals have the same brain structures, the same system, related to emotion that we have, so why not?" she said.  “Friendships” in the wild are rare and usually limited to specific scenarios, unlike the more widespread emotional bonds observed in captive environments. Captivity, interestingly, tends to intensify these cross-species bonds. When animals are removed from their natural social groups and placed alongside unfamiliar species, they often reach across the species barrier to form connection. A cheetah cub raised without feline companionship may bond deeply with a dog. The instinct for companionship, it seems, is robust enough to override even the deepest biological instincts. How do scientists tell the difference between animals that happen to be near each other and animals that actually care about each other? The answer lies in a handful of telling behaviors. Key indicators include mutual grooming (licking/cleaning), social play, sleeping in close proximity, shared resting, and protective gestures. These behaviors are largely driven by a mutual need for companionship, reduced stress, and the development of a unique, nonverbal communication system between the species.  Examples are cats “bunting” and dogs “playing bows“ to signal that what follows is fun, not threat. They show up in protectiveness, in excited greetings after separation, and most tellingly, in what researchers call active maintenance—an animal seeking another animal out simply because the other is nearby. Underlying all of this is what scientists increasingly call social intelligence: the ability to read, interpret, and respond to the emotional states of another being—even one that communicates in an entirely different language of sound and scent and movement. Dogs do this with remarkable fluency, picking up on human emotional cues with a sensitivity that still surprises researchers. Wild fish have been observed becoming bolder in the presence of domesticated ones. Vervet monkeys give specific alarm calls for specific predators, and other species nearby—birds, antelopes—have learned to understand and act on them. Using computational tools, scientists can track social interactions over time to differentiate cohesive, long-term bonds (e.g., in the plains zebra) from transient, accidental, or merely gregarious interactions.  In essence, if two animals are always together and they groom each other, it is likely a genuine bond. If they are only together at a specific feeding spot, it is coincidental proximity or mutual benefit.  Biological anthropologist Barbara J. King says in this video that “animals don’t grieve exactly like we do, but this doesn’t mean that their grief isn’t real. It is real, and it’s searing, and we can see it if we choose.” The Question of Feelings All of this points toward a territory scientists once entered reluctantly: the question of whether animals have feelings. The evidence now suggests that many do, and with a sophistication that challenges older assumptions about the uniqueness of human emotion. For example, “a growing body of scientific evidence supports the idea that nonhuman animals are aware of death, can experience grief, and will sometimes mourn for or ritualize their dead,” says bioethicist Jessica Pierce. Neuroscience experiments have identified that the same neural circuitry—spanning the amygdala and the prefrontal cortex—that activates in an animal experiencing pain also activates in the animal watching its companion suffer. Research at the University of Chicago found that free rats will learn to open a restrictive tube to release a trapped companion. The free rats also tended to the trapped rats first, even before accessing proffered chocolate, demonstrating what appeared to be empathy-driven behavior. Prairie voles groom and comfort distressed mates, driven by oxytocin, the same bonding hormone found in humans. Observations in complex social animals like primates, elephants, and dolphins show them displaying comforting behaviors toward stressed individuals and acting in ways suggesting grief for the dead, as described in this BBC Earth YouTube video.  In primates and other social animals, scientists have also documented empathy-like behaviors, including comforting distressed companions, sharing resources, or helping injured individuals. A recent long-term study of chimpanzees even found cases in which individuals treated the wounds of unrelated companions, raising intriguing questions about the origins of caregiving and compassion. How Do Animals Communicate across Species Boundaries? Social intelligence allows animals to interpret nonverbal cues and emotional states across species, fostering empathy and bridging communication gaps to form deep emotional bonds. Most interspecies communication relies on “eavesdropping” on universal auditory, visual, and chemical signals that convey vital information regarding predators, prey, or territory. These shared systems include specific alarm calls, such as those used by vervet monkeys, as well as tactile cues and scent marking to define boundaries and reduce conflict. Collectively, these methods enable social animals to navigate complex multispecies environments and build relationships through mutual understanding. Cooperative behaviors in animals strongly suggest the presence of advanced cognitive abilities, including rudimentary emotional awareness, social intelligence, and in some cases, shared intentionality. These behaviors indicate that animals are not merely driven by instinct but can possess a “theory of mind” that allows them to understand and respond to the goals, intentions, and emotional states of others.  Cooperative behaviors, such as the boundary patrols of chimpanzees or collaborative hunting, suggest that animals can plan, share intentions, and understand the need to work together to achieve a mutual goal. New research, particularly in cognitive science and neuroscience, is reshaping ethical debates by objectively validating animal sentience, emotions, and consciousness. Social species, which are more likely to cooperate, often show higher levels of self-awareness (such as mirror self-recognition in dolphins) and can distinguish between consistent cooperators and noncooperators. Some animals, such as primates, can remember past interactions and selectively cooperate with partners who have helped them before, suggesting memory-driven social relationships. Studies in mice show that cooperation relies on the anterior cingulate cortex of the brain, which acts as a hub for representing the partner’s position and making coordinated social decisions. Why It Matters New research, particularly in cognitive science and neuroscience, is reshaping ethical debates by objectively validating animal sentience, emotions, and consciousness, shifting the focus from whether animals suffer to how they experience suffering. These findings challenge existing regulatory frameworks, strengthening arguments for reducing animal experimentation and making it harder to justify practices where human benefit is not heavily proven to outweigh animal suffering.  As science demonstrates greater cognitive complexity, the debate is evolving from utilitarian arguments (is the experiment worth the cost?) toward rights-based ethical frameworks that prioritize the inherent rights of animals, particularly for higher-order mammals.  That shift matters. It indicates that humans are not alone in the capacity for connection. We share this Earth with creatures who, in their own ways, also choose loyalty, also seek comfort, also grieve. *Dirk Anthonis is a freelance writer and former New York City Tribune editor who lives in Kansas City, Kansas.

Why the World Treks to Slovenia to Taste Her Love of Nature and Place By Mark Smith* Chef Ana Roš ©Ciril Jazbec Like something from a fairy tale, Slovenia’s Soča Valley possesses an almost ethereal beauty. Stretching from the heart of the Julian Alps to the Italian border, the luminous emerald waters of the Soča River wind their way from the rocky slopes, where edelweiss flowers bloom, to the rolling pastures where world-famous Lipizzaner horses run. It is here, in this extraordinary landscape, that a quiet culinary revolution has taken root. At its center is Hiša Franko, a restaurant shaped by the philosophy of Ana Roš, one of the most influential chefs in modern gastronomy. Hiša Franko is housed in a guesthouse that dates back to 1861. ©Ciril Jazbec A former Alpine skier and would-be diplomat who taught herself to cook, Roš has transformed this remote restaurant into a global destination. It is not only celebrated for its cuisine but for its deep connection to the surrounding environment. Roš has transformed the remote restaurant into a global destination. It is not only celebrated for its cuisine but for its deep connection to the surrounding environment. Located just outside the town of Kobarid, Hiša Franko is housed in a guesthouse that dates back to 1861. Mountain view of the Soča Valley and the town of Kobarid, Slovenia. Istock Grounded in local ecosystems, biodiversity, and sustainable food systems, its menus are built from what the Soča Valley provides. From wild herbs and mushrooms gathered in nearby meadows and forests, to river-caught trout and cheeses made by farmers high in the mountains, the valley is its pantry. Chef Ana leads foraging in the mountains surrounding Soča Valley. ©Ciril Jazbec “I believe the Soča Valley is the greatest source of inspiration for Hiša Franko’s cuisine and for the way I think about food,” Roš told The Earth & I. “Everything is rooted in seasonality and micro-locality. “Around 95% of our fruits, vegetables, and wild plants come from an incredibly small area. In fact, when you stand on one of the nearby mountain peaks, you can almost see every place we source from.” “Around 95% of our fruits, vegetables, and wild plants come from an incredibly small area. In fact, when you stand on one of the nearby mountain peaks, you can almost see every place we source from.” ©Ciril Jazbec That deep-rooted connection to place, however, predates Roš herself. Long before she took the reins, the restaurant relied on local producers—not out of philosophy but “a necessity,” she explained. “When I first arrived, my former mother-in-law, who was the chef at the time, already worked closely with what she could find around the restaurant,” she said. “She used wild blueberries when they were in season, foraged mushrooms, and even bear meat from local hunters. “The truth is, Hiša Franko is so remote from most Slovenian cities that suppliers rarely reach us. Being local—and therefore seasonal—wasn’t a stylistic choice but a necessity. We had to rely on what the land around us provided, and over time, that became a defining part of who we are.” That philosophy has brought global recognition. In 2017, Roš was named the World’s Best Female Chef by The World's 50 Best Restaurants. In 2023, Hiša Franko became the first Slovenian restaurant to be awarded three Michelin stars. It was also among the first restaurants in the country to receive the Michelin Green Star in 2020, an award specifically for establishments at the forefront of sustainable gastronomy. It has successfully retained this distinction every year, including in the 2025 Michelin Guide. Hiša Franko became the first Slovenian restaurant to be awarded three Michelin stars. It was also among the first restaurants in the country to receive the Michelin Green Star. “I believe one of the greatest achievements any chef can reach is earning three red Michelin stars and a Green Star,” Roš said. “The red stars represent the highest level of culinary excellence and a certain world of luxury. The Green Star is equally meaningful, but very different—it represents true sustainability,” she said, adding: “It recognizes chefs who may not work with luxurious ingredients, but who elevate simple, honest products into something extraordinary.” “Sunflower praline and stone fruit bite” is crafted from sunflower fields in Kobarid. The cottage cheese is also from Kobarid. ©Ciril Jazbec “Summer harvest” is made from melon, squash blossoms, and Mirabelle plums from Orto Felice. ©Ciril Jazbec For Roš, sustainability is not an add-on but a guiding principle embedded in every aspect of the restaurant’s work. “We focus strongly on reducing food waste, working strictly with seasonal and local ingredients, and collaborating closely with the local community,” she said. “We focus strongly on reducing food waste, working strictly with seasonal and local ingredients, and collaborating closely with the local community.” In recent months, Hiša Franko has added a composting system to its rear garden. “We have a dedicated person overseeing it and sharing knowledge with the entire team, ensuring that everyone feels involved and responsible for the process,” she said. The valley has benefited from the restaurant—the sustainability mindset is being widely credited with boosting jobs and tourism in the region. In fact, Roš was appointed an Ambassador of Gastronomic Tourism by the United Nations World Tourism Organization (UNWTO) because of her efforts to revitalize the valley through sustainable food tourism and local sourcing. Indeed, Roš’ ability to work with and inspire others seems to be as innate as her passion for the culinary arts. Fluent in seven languages, she trained in international and diplomatic studies in Italy, seemingly destined for a career in diplomacy before life took a very different turn. That global perspective now informs her latest venture. In March 2026, she opened a new restaurant, JAZ, in Poreč, Croatia, on the Istria peninsula. Located along the seaside promenade in the heart of the old town, its menu is once again shaped by place—this time, the Adriatic Sea. Aerial view of Poreč’s old town. istock “I know Istria very well, so nothing here feels entirely new to me,” she said. “I like to work a lot with vegetables, and I believe one of the biggest opportunities lies in foraging—something Istrians rarely do beyond wild asparagus.” The region, she noted, offers an abundance of exceptional ingredients: “Some of the best tomatoes in the world, traditional homemade pastas, beautiful olive oils, and, of course, truffles. And once you move to the coast, you enter a different world, with exceptional scallops, sole, and wild oysters.” Looking ahead, Roš remains both hopeful and cautious about the future of sustainable fine dining. “I honestly hope it will survive. My generation has spent more than 20 years working to show that nature itself can be the greatest luxury. I would hate to see people—guests and chefs alike—losing sight of that.” And for aspiring chefs hoping to follow a similar path, her advice is simple: “Keep your eyes open—and don’t stop dreaming.” *Mark Smith is a journalist and author from the UK. He has written on subjects ranging from business and technology to world affairs, history, and popular culture for the Guardian, BBC, Telegraph, and magazines in the United States, Europe, and Southeast Asia.

How Home Cooks Can Heal Themselves and the Earth with Nutritious, Tasty Cuisine By Julie Peterson* Dietician teaches class on nutritious meal prep. Istock One of the world’s most powerful (and overlooked) healthcare settings is the home kitchen. But there’s no need to bring in a professional chef, subscription meal plan, or expensive appliances to transform a kitchen into a space where healthy mealtimes happen. A little knowledge of culinary medicine can turn ordinary cooking practices into effective disease prevention, adjuncts to medical treatments, and keys to any healing or wellness journey.   Culinary medicine is an emerging field that blends nutrition science, preventive medicine, and culinary skills. It can benefit anyone looking to improve their health by eating better, but it can also be used to prevent or manage conditions, such as diabetes and cardiovascular disease.   Unlike traditional nutrition education, culinary medicine covers skills like food shopping, meal planning, cooking, and food storage. The results are positive, science-backed health outcomes and a reduced environmental footprint.   Food is Medicine Historically, physicians knew that food provided health and healing and came from local sources. But that wisdom was lost somewhere between fast-food restaurants and highly processed shelf-stable groceries. Farmers’ markets weren’t always a luxury found in particular neighborhoods; they were places to purchase or trade for food that you did not grow. A farmer’s market in Brazil. Pexels Fast-forward to today, and one might assume that family physicians and medical providers are knowledgeable about nutritional needs. However, according to a 2014 article in the American Journal of Medicine, healthcare professionals (excluding registered dietitians) spent only 1% of their medical school lecture hours learning about nutrition.   According to a 2014 article in the American Journal of Medicine, healthcare professionals (excluding registered dietitians) spent only 1% of their medical school lecture hours learning about nutrition.   That situation is rapidly improving, thanks to medical doctors and professional chefs like John La Puma, MD. They have been ahead of the curve, creating a wave of interest in culinary medicine that has sprouted college courses and degrees, cooking clinics, and awareness that food can and should be part of the body’s defense against illness and disease.   La Puma is a professionally trained chef and regenerative organic farmer. In 2003, he partnered with Michael Roizen, MD, to teach the first culinary medicine course in a medical school. As founder of Chef Clinic, La Puma helped establish culinary medicine as a clinical and educational movement, demonstrating how cooking skills can serve as therapeutic tools in chronic disease prevention and lifestyle medicine. This idea quickly caught on and, today, similar classes are taught in 80% of US medical schools.   Organizations, such as the American College of Culinary Medicine and the Teaching Kitchen Collaborative, continue to advance research, certification, implementation, and instruction frameworks in culinary medicine for clinicians, chefs, and communities. Culinary medicine education is also ongoing at several American universities, including Tulane University, Yale, the University of Chicago, Ohio State, Penn State, the University of Kentucky, and more. Video introducing culinary medicine and ACLM’s Culinary Medicine Program. Another forerunner in the field is Michael Fenster, MD, known as Chef Dr. Mike. Fenster is an interventional cardiologist and professional chef who shifted toward combining medicine and culinary arts after realizing that his cardiology patients were being fed hospital food that went against everything he would recommend to someone with heart disease. He now holds cross-faculty appointments at the University of Montana College of Health and the Missoula College Culinary Arts Program and, with help from “professionals from around the world and the University of Montana,” developed the Culinary Medicine Program.   Fenster believes that assembling and eating food should be joyful, delicious, and healthy. “Our relationship to the ingredients we gather for the meal is a powerful connecting point for ourselves with family and friends, the larger community, our environment, and the planet,” he explains. He adds that the new ways culinary medicine looks at food are actually the old ways. After all, it was Greek physician Hippocrates (460 BC to 370 BC) who said: “Let food be thy medicine and medicine be thy food.”   Your Kitchen Clinic The USDA Economic Research Service shows that, as of 2023, Americans spend about 55% of their food budget on restaurants and takeout. In addition, frozen meals are becoming a main dish for many due to rising grocery costs and convenience. However, these food choices have health implications. By making small changes, every meal can provide preventive healthcare.   The USDA Economic Research Service shows that, as of 2023, Americans spend about 55% of their food budget on restaurants and takeout. About 55% of US food budgets are spent on restaurants and takeout. Pexels La Puma emphasizes that the first step to implementing culinary medicine at home is to cook more meals in your own kitchen, pointing out that “Home cooking allows you to have complete control over what goes into your body.” From choosing ingredients, to preparing and cooking for nutrient preservation, one can manage any food sensitivities, portion sizes, and flavor preferences. Regularly preparing and eating healthy meals improves cooking skills, saves money, and improves health.   Because people are busy and often say they don’t have time to cook, La Puma recommends setting one to two days aside each week to cook and then prepare large enough quantities to have leftovers. Cooking days are also the time to wash and package raw veggies for quick snacks (a great job for kids). Veggies such as bell peppers, broccoli, cauliflower, carrots, celery, cucumbers, grape tomatoes, radishes, and sugar snap peas are easy to wash, slice (if needed), and store.   For those who feel a bit lost when it comes to cooking, do not despair. Chef Dr. Mike offers free cooking tutorials and recipes. The USDA has a healthy recipe collection for all ages, food preparation videos, and tips on shopping, cooking, and meal planning. The American Diabetes Association has free live virtual cooking classes with others available on-demand. Homemade Cooking provides cooking shows led by chefs and a library of recipes. In addition, there is an abundance of free apps that cover similar topics.   The research continues to support the idea that culinary medicine programs enhance metabolic health, food literacy, and chronic disease prevention. If the idea that hands-on cooking in your kitchen can prevent disease isn’t enough to motivate you, consider that simple shifts in food preparation strategies have also been shown to increase survivorship in those who already have chronic illness.   Environmental Health A 2019 EAT-Lancet summary report indicated that to meet our global sustainable and healthy eating goals by 2050, we need to “double our fruit, vegetable, nut and legume intake and reduce our meat and sugar consumption by 50%.” Culinary medicine’s alignment with these recommendations places it at the intersection of health and environmental sustainability.   Dietary shifts toward plant-forward, minimally processed foods are associated with lower greenhouse-gas emissions, reduced land use, and improved ecosystem outcomes, according to research summarized by the Tulane School of Public Health.   Dietary shifts toward plant-forward, minimally processed foods are associated with lower greenhouse-gas emissions, reduced land use, and improved ecosystem outcomes.   Other small changes cooks can make to support health and create a sustainable food future include buying food locally and in season.   A Healthier, Holistic Future Culinary medicine is gaining momentum as healthcare systems look for more holistic approaches, prioritize patient empowerment, and focus on prevention. When nutrition is fully integrated into medical education and practice, we may receive prescriptions for blueberries and broccoli—and have them covered by insurance.   As kitchens in schools, hospitals, corporations, and homes embrace the principles of culinary medicine, human health can evolve in ways that honor the body’s innate capacity to heal when given the right tools—beginning with what’s for dinner. *Julie Peterson writes science‑informed articles for healthier people and a healthier planet.

How One of America’s Filthiest Waterways Became a Model of Urban Environmental Recovery By Deborah Harvey* The Chicago River, once described as a fetid industrial sewer, now hosts pleasure craft and riverside restaurants. Ajay Suresh/Wikipedia On warm spring mornings, kayakers glide past downtown Chicago’s glass towers, their paddles cutting through water that reflects the skyline in shimmering blue. Along the riverwalk, joggers and families pause to watch herons stalk fish near the shoreline. It is a scene that today feels ordinary, almost serene. This was not the case many years ago. Instead, the Chicago River was once viewed as one of the most polluted waterways in the United States. Now, thanks to decades of government and private efforts, this mighty river has been largely rehabilitated and now stands as an example of environmental recovery in a heavily populated and industrial urban area. Reversing the River For much of the 19th and early 20th centuries, the Chicago River was inundated with industrial waste from factories, runoff from slaughterhouses, and untreated sewage that flowed directly into its channels. Residents described the river as a foul, “stinking” corridor that could make a person ill simply by standing nearby. Fish populations collapsed, aquatic life struggled to survive, and by the 1920s, river swimming had all but disappeared. The crisis forced Chicago to do something unprecedented. In 1900, engineers completed one of the most ambitious urban infrastructure projects in American history: the reversal of the Chicago River’s flow. Instead of allowing the river to dump its pollution into Lake Michigan, the city’s primary source of drinking water, engineers redirected the river inland, through the Chicago Sanitary and Ship Canal, toward the Mississippi River system. The move helped protect public health in Chicago, but it did not solve the river’s underlying contamination problems and ended up sending its toxic waters downstream. The river reversal was “an extraordinary engineering response to a public health emergency,” said author Richard Lanyon, former executive director of the Metropolitan Water Reclamation District of Greater Chicago. “But reversing the river was only the beginning. It bought time. It did not clean the river,” he wrote in his 2012 book, Building the Canal to Save Chicago. For decades after the reversal, combined sewer system overflows continued to send untreated waste during heavy rains into the river, and industrial runoff and urban development worked to destroy its water quality. By the mid-20th century, the Chicago River had become a symbol of the environmental costs of rapid industrial growth. The Taylor Street Bridge was raised to allow a three-masted ship to pass along the heavily industrized Chicago River, circa 1919. H.C. Leighton Co., Portland Me. No. 686 - Postcard scan A Chicago “L” Ravenwood train (Brown Line) crosses the north branch of the Chicago River as kayakers enjoy the water. © Jeremy Atherton, 2006 Policy and Infrastructure The turning point came in the latter half of the 20th century, when environmental awareness began to reshape public policy across the United States. The Clean Water Act of 1972 marked a critical shift, establishing enforceable standards for water quality and regulating pollutant discharges. For the Chicago River, this legislation set in motion a long-term recovery process. “We have made a lot of progress in cleaning up historic pollution and in trying to prevent more pollution through both a system of regulation and laws and permits,” Debra Shore, a former EPA regional administrator and previously a commissioner of the Chicago area’s Metropolitan Water Reclamation District, told Goucher Magazine in 2022. “Everyone deserves safe water to drink, clean air to breathe, and to not live on contaminated soils.” Yet policy alone was not enough. Chicago also invested in massive infrastructure projects to address one of its most persistent problems—combined sewer overflows. During storms, rainwater and sewage would overwhelm the system, sending untreated waste directly into the river. To combat this, the city undertook the Tunnel and Reservoir Plan, commonly known as the Deep Tunnel, a vast underground network designed to capture and store excess stormwater and sewage until it could be treated. The Deep Tunnel system is one of the most significant urban water management projects ever built, according to Lanyon and many others. It dramatically reduced the frequency and volume of untreated discharges into the river. At the same time, wastewater treatment plants were upgraded to remove more contaminants from the water. Advances in treatment technology reduced nutrient loads, improved oxygen levels, and created conditions that allowed aquatic life to return. A River Reborn From a scientific perspective, the river’s recovery has been striking: Improvements in water chemistry and sediment conditions have led to the gradual return of microbial communities and aquatic ecosystems. In fact, the number of fish species inhabiting the river has risen dramatically—from 10 to 77—from 1972 to now. The fish populations “changed because the water is cleaner due to cleaner sewage management practices,” Austin Happel, research biologist at Chicago’s Shedd Aquarium, recently told Inside Climate News. In 2025, hundreds of swimmers took part in the first organized swim in the Chicago River in nearly a century. Today, herons, cormorants, and even bald eagles call the river home, as do beavers, otters, muskrats, and a variety of other mammals. Sections of the river that once repelled visitors now attract kayakers, anglers, and tourists. In 2025, hundreds of swimmers took part in the first organized swim in the Chicago River in nearly a century, a symbolic milestone that underscored how far the river has come. “It’s pretty clear that the Clean Water act has played an absolutely critical role in why we’ve had decades of progress,” said Jared Policicchio, deputy chief sustainability officer for the Chicago Department of the Environment, in an interview with CBS News in 2025. The Ida B. Wells Boulevard Bridge raises to allow tall boats to pass. Sea Cow/Wikipedia But infrastructure and regulation tell only part of the story. Civic engagement played a crucial role in transforming the river’s identity from an industrial sewer to a shared public resource. Margaret Frisbie, executive director of Friends of the Chicago River, has spent decades advocating for the river’s restoration along with other civic groups. “I cannot tell you what it feels like for me to stand here [amid] the magic of the river and know how many people worked together to make this happen,” she told a gathering in 2015 that opened the Chicago Riverwalk, a pedestrian promenade along the river with restaurants, bars, cafes, boat and kayak rentals, and floating wetland gardens for ecological education. The Chicago Riverwalk [is] a pedestrian promenade along the river with restaurants, bars, cafes, boat and kayak rentals, and floating wetland gardens for ecological education. “Friends of the Chicago River,” she continued, “was founded in 1979 to improve and protect the Chicago River. Our vision is that the Chicago River is one of the world’s greatest metropolitan rivers, and I really think that we’re on our way. We have been working for decades to improve the water and the resources for people and for wildlife, and the city’s been an extraordinary partner.” Organizations like Friends of the Chicago River have worked to raise awareness, promote habitat restoration, and push for stronger environmental protections. Their efforts have helped reconnect Chicago residents with a waterway that had long been ignored or avoided. A portion of the Riverwalk, a Chicago River-side pedestrian promenade in downtown Chicago. Dimi Talen/Wikipedia Urban design has further reinforced this reconnection. Riverwalk developments, floating wetlands, and habitat restoration projects have transformed the river’s edges into accessible public spaces. These initiatives not only improve ecological conditions but also encourage people to engage with the river in everyday life. “When people experience the river directly, whether kayaking, walking, or simply sitting by the water, it changes their perspective,” Frisbie added. “They begin to see it as something worth protecting.” Despite its remarkable recovery, the Chicago River still faces challenges. Combined sewer overflows, though reduced, have not been entirely eliminated. Legacy pollutants remain embedded in river sediments, posing long-term risks. Urban runoff continues to carry contaminants into the waterway, particularly during heavy rainfall. These ongoing challenges highlight an important reality. Environmental restoration is not a one-time achievement but a continuous process. Maintaining progress requires sustained investment, adaptive management, and public commitment. Yet the Chicago River’s transformation offers a powerful example of what is possible. Once dismissed as irredeemably polluted, the river now serves as a model of urban environmental recovery, demonstrating how engineering, policy, science, and community action can work together to restore degraded ecosystems. Its story carries lessons for cities around the world. First, large-scale environmental problems can be addressed when governments commit to long-term solutions. Second, infrastructure investments, while costly, can yield profound public health and ecological benefits. Third, public engagement is essential. When people value a natural resource, they are more likely to support its protection. Perhaps most importantly, the Chicago River shows that even heavily damaged ecosystems can recover when given time, resources, and care. Standing along its banks today, it is difficult to imagine that this same river was once considered beyond saving. The water may not be pristine, and the work is far from complete, but the transformation is undeniable. Whether other cities can replicate Chicago’s success likely depends on two things: 1) their willingness to invest in infrastructure and policy and 2) embracing a vision of restoration that sees polluted waterways not as lost causes but as opportunities for renewal. *Deborah Harvey is a writer and researcher focused on science, technology, sustainability, and global innovation. Her work explores how emerging ideas shape the future of energy, infrastructure, and the environment.

Rapid Climate Changes in the Far North Are Rippling Worldwide By Chi-Hyun Park* Warmer oceans lead to less summer sea ice, rising sea levels, and increased heat absorption. Courtesy of Chi-Hyun Park/Clipart Korea/News Penguin The planet isn’t warming evenly—it’s unraveling fastest at the top. In the Arctic, temperatures are rising four times faster than the global average, turning what was once Earth’s frozen stabilizer into a rapidly shifting engine of change. The data no longer sketch centuries-long natural cycles; they spike, surge, and accelerate. Ice that endured for millennia is vanishing within decades, and the consequences are no longer confined to the Far North. This is not a warning about the distant future—it is a transformation already underway. What's happening in the Arctic has become the clearest, most immediate signal of how the Earth system is responding to a warming world. What happens here does not stay here: It reverberates through oceans, atmosphere, and coastlines worldwide, reshaping the conditions on which modern civilization depends. What a 1.5°C Warmer Climate Means In 2025, the World Meteorological Organization announced that the global mean temperature, averaged over the previous 12 months, was effectively 1.5°C above preindustrial levels. Crossing this threshold significantly increases the likelihood that extreme heat waves, droughts, floods, and ice loss will intensify. For decades, scientists have identified 1.5°C as a critical tipping point. Observed warming trends are unambiguous. According to the Intergovernmental Panel on Climate Change (IPCC), the global mean temperature for 2011–2020 was already 1.09°C above preindustrial levels. The rate of increase has since accelerated. In 2023, the global temperature reached 1.45°C above preindustrial levels. In 2024, driven by a strong El Niño weather phenomenon and continued greenhouse gas emissions, global temperatures reached the highest level on record. Warming has grown steadily. The oceans continuously absorb heat, while atmospheric greenhouse gas concentrations continue to rise. Over the past decade alone, global temperature has increased by an additional 0.3°C. Climate change cannot be attributed to a single cause; it reflects a planetary-scale accumulation of energy. That energy manifests differently across regions. According to the IPCC baseline (relative to 1850–1900), the global mean temperature has risen sharply since the late 20th century, with the rate of increase accelerating markedly over the past decade. Credit: NOAA Since the Industrial Revolution, atmospheric carbon dioxide concentrations have risen from 280 parts per million (ppm) to over 420 ppm. Methane has also increased significantly. These gases trap heat: They absorb infrared radiation emitted from the surface and reradiate a portion back toward Earth. As a result, the planet now retains slightly more energy than it emits to space. Acceleration in the Arctic The Arctic is the most rapidly warming region on Earth. Over the past 40 years, it has warmed nearly four times more rapidly than the global average. Since satellite observations began in 1979, Arctic temperatures have increased by approximately 0.6°C per decade, compared to about 0.2°C globally. This disparity originates from surface changes. Snow and ice reflect 80%–90% of incoming solar radiation, limiting heat accumulation. When ice melts, however, it exposes darker ocean surfaces that absorb rather than reflect sunlight. Consequently, the same solar input results in significantly greater heat retention. In regions where ice has retreated, absorbed summer solar energy has increased by as much as 20 watts per square meter. The ocean has a strong capacity to store heat. Heat accumulated during summer is released back into the atmosphere during autumn and winter. As a result, Arctic winter temperatures are rising faster than summer temperatures. The Arctic continues to warm through a cycle of seasonal heat storage and release—an energy flow directly confirmed by observations. When Permafrost Thaws Arctic soils contain an estimated 1,500–1,700 gigatons of carbon—roughly twice the amount currently in the atmosphere. For millennia, this carbon remained locked in frozen ground. As temperatures rise, however, permafrost is thawing. In some regions, ground temperatures have increased by more than 1°C over the past two decades. As soils thaw, microbial activity resumes, releasing carbon dioxide and methane. Methane, over a 20-year time scale, has more than 80 times the globe-warming potential of carbon dioxide. Satellite observations have confirmed methane emissions increasing in regions such as Siberia and Alaska. Some projections suggest that an additional 150–200 gigatons of carbon could be released by 2100. Wildfires further amplify this process. Since 2003, Arctic fires have emitted an average of 0.2 gigatons of carbon annually. Rising temperatures and increasing dryness have made fire-conducive conditions more frequent. According to recent NOAA reports, when wildfire emissions are included, parts of the tundra—particularly in eastern Siberian lowlands—have already shifted from being net carbon sinks to net carbon sources. The Arctic carbon cycle is gradually changing direction. Arctic Change and Sea-Level Rise Greenland’s ice sheet is rapidly losing mass, with 250–270 gigatons disappearing annually since 2002. This contributes approximately 0.7–0.8 mm per year to global sea-level rise—about four times the rate observed in the 1990s. Melting is particularly pronounced near Jakobshavn Glacier. Glaciers are melting, collapsing into the sea, and rapidly retreating due to global warming. Scientists are closely observing the emergence of darker ocean surfaces as the ice shrinks. Courtesy of Chi-Hyun Park/Clipart Korea/News Penguin Arctic sea ice has also declined significantly. Since 1979, summer sea ice extent has decreased by 40% to 45%, while the proportion of older, thicker ice has fallen from 60% to below 15%. Ice-free ocean surfaces absorb more solar radiation, accelerating warming. In ocean areas such as the Barents Sea, Kara Sea, Chukchi Sea, and Beaufort Sea, summer sea surface temperatures are now 2–4°C higher than in the past. This heat is transferred back into the atmosphere. As the Arctic warms, the temperature gradient between the poles and midlatitudes weakens. This reduces the strength of the jet stream and destabilizes its flow. Since 1990, winter minimum temperatures over Northern Hemisphere midlatitude land areas have increased by about 0.4°C per decade. Extreme cold events are generally becoming less frequent, reflecting progressively milder winters. Arctic warming is altering atmospheric circulation, with measurable impacts on midlatitude climates. Meltwater from Greenland flows into the ocean. Being less saline, it is lighter than surrounding seawater, reducing vertical mixing and weakening ocean circulation. This affects the Atlantic Meridional Overturning Circulation, which has shown signs of weakening by 10%–15% since the mid-20th century. Arctic change does not end with ice loss; it propagates through sea-level rise, ocean circulation, and broader climate systems. Changes Already Underway—and What Remains More than 90% of the excess heat accumulated in the Earth system is absorbed by the oceans. Ocean heat content has continued to rise since 2000 and remains at record levels. Once stored, this heat is released slowly over decades to centuries. Sea-level rise reflects this accumulated heat. Since 1900, global mean sea level has risen by more than 20 cm. The rate of rise has accelerated from 3.3 mm per year since 1993 to about 4.5 mm in recent years. Thermal expansion of seawater and melting land ice both contribute to this increase. Future changes depend on greenhouse gas emissions. With low emissions, sea-level rise by 2100 may be limited to around 0.3 meters. Under high-emission scenarios, it could rise by more than a meter. While existing heat ensures continued change, future emissions will determine its pace and magnitude. A Calculated Future Revealed by the Arctic The Arctic summer is losing its previously uninterrupted whiteness. Sunlight that once reflected off ice now penetrates the dark ocean. The sea quietly accumulates heat. Though invisible, the measurements are unequivocal: Ocean temperatures and heat content continue to reach new records year after year. Glacier margins retreat by tens of meters annually. Satellites track this movement, and the data point in a consistent direction. Ice is thinning, and melt seasons are lengthening. This is not a seasonal fluctuation. Heat stored in the ocean persists and circulates over decades. Once initiated, this trajectory is not easily reversed. Energy already integrated into the system continues to produce outcomes. If current trends persist, future coastlines will be drawn in different places. What is considered “average” today will no longer serve as a baseline, and extremes may become the norm. The Arctic stands at the forefront, revealing these changes. What it shows is not a possibility, but an unfolding reality—one that foreshadows the future of regions yet to arrive at the same threshold. *Chi-Hyun Park is a longtime Korea-based environmental journalist who holds a PhD in engineering.