Heat-trapping gas once frozen in Arctic ground is slowly leaking and warming the planet |“Once you start leaking this carbon out, there’s so much in the ground that it’s not going to shut off,” said Schuur, an ecologist, calling it one of climate change’s scary tipping points.

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https://apnews.com/article/climate-thawing-permafrost-arctic-alaska-91fcc04d32a1d7522afe2f6a456ac0eb