Tuesday, April 08, 2008

Negative or Positive Feedback

Read the whole thing, but this is a key sentence:
"Yet it is reliably inferred from palaeoclimatological data that no “runaway greenhouse effect” has occurred in the half billion years since the Cambrian era, when atmospheric CO2 concentration peaked at almost 20 times today’s value"
If the entire IPCC report is based upon a positive feedback loop, why didn't that feedback result in runaway global warming in the distant past but will do so now?

That is the bottom line and another reason why I will be watching to see what happens in the next 20 years. Already, the temperature increase seems to have halted as the graphs clearly show. Is this the beginning of the end of the global warming hypothesis?


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