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Originally Posted by redpoint5
What history tells us though is that 99% of Earth history has had higher concentrations of CO2 than we currently have...
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99% of Earth's history starting when? From the beginning, about 4.5 billion years ago, you've got about 2 billion prior to the Great Oxygenation Event. The Cambrian Explosion and serious multicellular life didn't get going until ~530 million years ago, so that's about 88% of Earth's history used up before we get to anything much more complex than pond slime.
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In the long term, life won't even notice the change in CO2.
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Depends on what sort of life we're talking about. Deep-sea vent communities probably won't notice much. Those of us living closer to the surface might do well to read up on the Permian-Triassic Extinction, which is the closest geological model we have to the current situation:
https://en.wikipedia.org/wiki/Permia...tinction_event