Permafrost thaw unsettles the Arctic | Climate News Network
“These observations have led me to believe that global warming is not a ‘fake’ but the reality. And here, in Alaska, we are dealing already and will be dealing even more in the near future with this reality,” said Vladimir Romanovsky, of the University of Alaska’s geophysical institute, one of the authors.
Climate scientists and glaciologists have been warning about the rate of change in the Arctic for two decades: one estimate proposed that for every 1°C of warming, around 4 million square kilometres of permafrost − an area bigger than India − could thaw.
Locked in the frozen soil is an estimated 1,700 billion tonnes of carbon: this is about twice the mass of carbon in the atmosphere in the form of the greenhouse gas carbon dioxide. Its release could precipitate even more calamitous climate change. And the economic consequences – assessed at a potential cost of $43 trillion − could be ruinous.