Hopefully not falling back to the #SnowballEarth of 700 to 650mya or worse the #MethaneEarth (I call that Planet Fracked) prior to #cyanobacteria.
Assuming that #nuclearwinter isn't full Snowball effect, it could be like #PETM (worse) or asteroid 66mya (only ~10 years cold) & leave some small rat.
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