Melting of large deposits of ice, in glaciers and in permafrost, has been frequently with about in the recent years. When it comes to meeting on Greenland, we seem to be following the rates of the worst case predictions of older IPCC reports.
https://www.tiede.fi/artikkeli/uutiset/gronlanti-sulaa-kuumimman-ennusteen-mukaan
There are some alarming developments in the Arctic permafrost of Sundries and Alaska. It seems like we will soon be crossing one threshold of positive feedback very soon.
https://www.washingtonpost.com/weather/2019/12/10/arctic-may-have-crossed-key-threshold-emitting-billions-tons-carbon-into-air-long-dreaded-climate-feedback/
“Especially noteworthy is the report’s conclusion that the Arctic already may have become a net emitter of planet-warming carbon emissions due to thawing permafrost, which would only accelerate global warming. Permafrost is the carbon-rich frozen soil that covers 24 percent of the Northern Hemisphere’s land mass, encompassing vast stretches of territory across Alaska, Canada, Siberia and Greenland.
There has been concern throughout the scientific community that the approximately 1,460 billion to 1,600 billion metric tons of organic carbon stored in frozen Arctic soils, almost twice the amount of greenhouse gases as what is contained in the atmosphere, could be released as the permafrost melts.”https://www.nytimes.com/2019/12/14/opinion/sunday/climate-change-arctic.html
“The ice is a great white shield that reflects incoming solar warming back to space during the long summer days of the midnight sun. Otherwise, it would be absorbed by the ocean. Losing this ice, the study explained, would be the warming equivalent of an extra 25 years of emissions at current rates.”
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