Gregory's Server@elliswyatt There are actually good data showing that current CO2 levels are higher than anytime in the past 5 MILLION years. The graph goes back 800,000 to cover the excellent quality ice-cores data.
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@elliswyatt There are actually good data showing that current CO2 levels are higher than anytime in the past 5 MILLION years. The graph goes back 800,000 to cover the excellent quality ice-cores data. 1 comment
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@petergleick Which is really not answering the question.
For instance, the last time there was a period of CO2 as LOW as we have it now, the latter half of the carboniferous period, it resulted in global glaciation.
Historically, since that time, the ppm has been around 2000.
So the question is, why is the greenest point in our carbon history unattractive, and the coldest and unhospitable time desirable?