Earth has been almost completely frozen in ice and had its surface completely vaporized by a planetary impact - both times life survived but yeah raising CO2 levels and the temp a little bit will wipe out microbes living on the bottom of the ocean and 5 miles underground
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there's some ambiguity in the "as we know it". but if things were as bad as she felt them to be then it seems like such ambiguity wouldn't be necessary
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