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  • Rated by planetenvy on Jul 02, 8:00am

    As long as permafrost is frozen, the carbon in the soil is locked up. But when it thaws, microbes break down the carbon and things get ugly for the climate as we know it.
  • Rated by moreminimal on Jul 02, 7:49am

    Carbon dioxide isn't the biggest greenhouse gas threat: it's methane. And there are millions of tons just waiting to be released from beneath the melting arctic permafrost.