U.S. government scientists calculate that levels of the potent heat-trapping gas methane rose at a record pace last year
in the global efforts to limit future warming to 1.5 or 2 degrees Celsius since pre-industrial times. The world has already warmed 1.1 to 1.2 degrees Celsius .
Methane is also a natural gas and an increasingly used energy source. Much methane comes out of livestock and human-generated agriculture, as well as from landfills. Scientists also fear future release of trapped methane under the ocean and in frozen Arctic land, but there's no indication that's happening on a large scale.
“It seems to be something else instead of COVID,” Lan said. She figures high levels in 2020 and then even higher levels in 2021, when lockdowns were eased, point away from a pandemic effect. In a study last year, Lan looked at the chemical isotopes to isolate where steady increases in methane emissions since 2006 may be coming from. The chemical signature pointed away from fossil fuels as the bigger guilty party and more toward either natural wetland emissions or agriculture, she said.
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