Atmospheric methane levels are rising, and isotopic ratios within the greenhouse gas suggest that the tropics may be to blame.
As northern Minnesota's climate got wetter, precipitation drove mobile forms of young carbon deeper into peatlands, doubling the size of methane-producing strata.
About two thirds of the gas produced by a study area near Barrow, Alaska, came from increasingly abundant greenery covering only 5% of the landscape, researchers estimate.
Why are Charon's poles dusted with reddish material?
New research suggests that release of methane from seafloor hydrates was much slower than hypothesized during a period of rapid global warming about 56 million years ago.
Three-dimensional simulations suggest that some aquifers may be more vulnerable to contamination from leaky oil wells than others.
In one of the first studies to investigate large lakes as methane sources, researchers found that Lake Erie is releasing more of the potent greenhouse gas than expected.
Data suggest that the United States may be responsible for half of global methane increase in the past decade.
Researchers trace carbon through Arctic soils and find an unlikely source of methane and surprisingly low methane oxidation in watersheds throughout northern Alaska.
A spike detected in surface methane released from a seasonally ice-covered lake in northern Sweden coincides with the spring thaw and lake overturn.