http://www.sciencemag.org/news/2020/02/only-humans-can-create-climate-altering-methane-burns-new-studies-suggest

New research suggests ancient methane—like that trapped in an Alaskan lake—won’t flood the atmosphere any time soon.

When it comes to forecasting global warming, methane is an unpredictable, menacing figure. The greenhouse gas is 28 times more powerful at trapping heat than carbon dioxide over a 100-year span. And as the planet warms, scientists fear vast stores of the gas will be released from Arctic permafrost and the deep ocean, warming the planet even further.