Oh, there's _another_ term used several different ways, that I was being sloppy about: evolution. It can happen really fast -- not that new species emerge fast, but because some of the organisms we have now will carry some traits (genes, alleles) that worked better during the last warm high-CO2 time, hung on at low levels, and will again be favored by warmer, higher-CO2 conditions, less sea ice, more erosion, and whatever. Organisms with those traits will have more grandchildren. That's one thing the plankton biologists are watching for nowadays.
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