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Good stuff James, I'll have to read up on it more.
What history tells us though is that 99% of Earth history has had higher concentrations of CO2 than we currently have, and our fossil fuels came from plants that flourished during times of high (average) CO2. Were actually near the low point in CO2 concentration in a geologic sense.
This isn't to say the rise is good for humans, only to say it isn't necessarily catastrophic for life in general accept in the short term pressure to adapt rapidly to the change. In the long term, life won't even notice the change in CO2.
Since we're more concerned about the wellbeing of humanity, it's this context that warming matters.
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