50%–65% of Methane Emissions Come from Human Activities

As a greenhouse gas, methane is 25 times more potent than an equal amount of CO2 over a 100-year period.

Methane emissions come from both man-made and natural sources. Some 50%-65% of methane emissions come from human activities.

Methane accounted for 10% of US greenhouse gas emissions in 2019.

In the US, methane emissions decreased by 15% from 1990 to 2019.

While agricultural emissions increased, emissions from landfills, mining, and fossil fuel production decreased.

US methane emissions came from the following sources in 2019: 30% natural gas and petroleum systems; 27% enteric fermentation (gas produced from cows and other livestock); 17% landfills, 9% manure management; 7% coal mining, 9% other sources.