Northern permafrost shifts from carbon sink to greenhouse gas source, study finds

A new study shows that Earth's northern permafrost region is shifting from absorbing carbon dioxide to releasing greenhouse gases. Between 2000 and 2020, it took in slightly more carbon than it emitted, but recent changes indicate it is now a net source of emissions. Researchers, including NASA scientists, found that thawing permafrost is releasing methane, a potent greenhouse gas. The study highlights the impact of warming temperatures, which are rising two to four times faster in the Arctic than elsewhere. Permafrost, which has stored carbon for thousands of years, is now contributing to global warming. The findings raise concerns about the future as extreme weather events add uncertainty to climate projections.