A study into the speed at which the permafrost is melting suggests that the tipping point will occur between 2020 and 2030 and will mark the point at which the Arctic turns from being a net "sink" for carbon dioxide into an overall source that will accelerate global warming, they said.
Melting of the Arctic 'will accelerate climate change within 20 years'
HT WarmingGlobe via twitter
They made that same prediction 20 years ago.
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