The melting of the Arctic permafrost threatens to release more greenhouse gases to accelerate global发表时间:2018-10-21 00:00 A NASA frontier survey found that the Arctic permafrost may have begun to melt and release greenhouse gases it has saved for decades, exacerbating global warming effects. And it could become a long-term source of greenhouse gas emissions to the atmosphere this century, more than scientists had expected, and the permafrost could remain carbon neutral for longer. And now research suggests that it is about to take a shorter time to become a significant source of carbon emissions. |