Thermokarst lakes, formed from thawing permafrost, in Alaska The Asahi Shimbun via Getty Images
As the Arctic gets warmer, large quantities of greenhouse gas could be released from the sediment at the bottom of lakes, a source that has previously been overlooked.
The frozen soil of the Arctic has already started to thaw, triggering the release of more methane and carbon dioxide into the atmosphere. This climate feedback is well known, but most modelling only accounts for thawing in the top 3 metres of Arctic soil.
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