Thread by @ClimateBen

“We may start to see widespread degradation in permafrost … somewhere in the timescale of 20–30 years,” Vladimir Romanovsky, a permafrost expert at the University of Alaska, said.'

That is to say as early as 2036.

grist.org/article/arctic…

'Thawing permafrost will release carbon to the atmosphere that will have an appreciable additional effect on climate change, adding at least one quarter of a degree Celsius by the end of the century and perhaps as much as one degree.' ⚠️

archive.thinkprogress.org/carbon-feedbac…

'Our analysis points out that the permafrost carbon feedback adds to this another 0.4 to 0.8°C warming'

From 2012:
huffingtonpost.ca/andrew-weaver/…

'NOAA analysis suggests that the globe’s unraveling permafrost is already releasing as much as 300-to-600 million metric tons of planet-warming carbon into the atmosphere annually, about as much as the myriad industrial and transport activities of France'
thebulletin.org/2020/05/scient…

'Current climate models do not account for the possibility of rapid permafrost collapse and the amount of gases it might release

Abrupt thawing is "fast and dramatic", Merritt said, adding: "Forests can become lakes in the course of a month, landslides..' sciencealert.com/permafrost-col…

Abrupt thawing of the permafrost:

'As temperatures rise, the perpetually frozen layer of soil, called permafrost, begins to thaw, releasing methane and other greenhouse gases into the atmosphere. These methane emissions can accelerate future warming...'

phys.org/news/2020-02-n…

The Arctic permafrost, frozen soil that is chock full of carbon, is a ticking time bomb.

'the permafrost feedback—which would see carbon emissions from permafrost lead to warming that would in turn thaw more permafrost—is already underway.' ⚠️

sciencemag.org/news/2019/10/g…

Permafrost is thawing so quickly that the Arctic is now a source – as opposed to a sink – of emissions, and that's without including methane... ⚠️

independent.co.uk/environment/me…