Arctic methane escape could cost $60 trillion


Grist

An almighty belch is building up deep in the belly of the Arctic, and it’s going to cost the world a pretty penny when it rips.

As the Arctic continues to melt, a 50-gigatonne reservoir of methane trapped in permafrost beneath the East Siberian Sea will be released — perhaps steadily over five decades or perhaps during one sudden grandfatherly burp — and that will cause an estimated $37 trillion to $60 trillion worth of damage. So say researchers in a commentary published Wednesday in the journal Nature.

Methane is a particularly potent greenhouse gas. “Higher methane concentrations in the atmosphere will accelerate global warming and hasten local changes in the Arctic, speeding up sea-ice retreat, reducing the reflection of solar energy and accelerating the melting of the Greenland ice sheet,” the researchers write. “The ramifications will be felt far from the poles.”

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