A climate tipping point could occur within the next 20 years as the melting Arctic ice is set to release huge quantities of Carbon locked away as frozen plant matter under the vast permafrost region of the Arctic. A study which analyzed the speed at which the permafrost is melting has said that the tipping point will occur between 2020 and 2030. That event will mark the point where the Arctic turns from being a Carbon sink into a Carbon source. The permafrost region covers about a quarter of the Northern Hemisphere and the top three metres contain most of the frozen plant matter.
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