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I already know CO2 concentrations are about 400 ppm, up from about 280 before the industrial revolution. It's way up from a recent geologic low of about 180, which is barely enough to support plant life.
I know these increased concentrations are directly responsible for the "greening" of the earth as plant growth increases.
How any of that will play out in the future is unclear, which is why I don't lose any sleep.
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