Carbon dioxide concentrations have been high before, the ice has melted, sea level has risen, the glaciers have advanced and retreated ... cycle after cycle. We think we know what causes CO2 to increase, but ...
Q: In the many cycles which occurred before the arrival of man, what caused the cycle to reverse itself and cool the planet back down?
A: ??? If we knew the answer to this question, we'd know what to do.
But we don't, so we don't.
Or do we?
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