Mysterious craters that have opened up in remote parts of the Siberian tundra were created by the release of methane gas beneath thawing tundra. What’s causing this? As climate change warms the Arctic, the permafrost, the permanently frozen layer that covers and insulates the tundra, defrosts and releases enormous amounts of methane, sometimes with enough pressure to blow a 30m wide hole in the ground. And of course methane can have 25 times the impact of CO2 on atmospheric warming.
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Giant sink holes in Siberia foreshadow climate change doom
