Re: Even doubling or tripling the amount of CO2′ will have ‘little impact’ on temps
- From: Sam Wormley <swormley1@xxxxxxxxx>
- Date: Fri, 05 Sep 2008 21:29:27 GMT
doug wrote:
A lot of what is predicted comes from computer models extrapolating.
Extrapolation is always dangerous and should be checked with physics
whenever possible. It is interesting to do a calculation of the
temperature rise due to CO2 using the basic blackbody radiation laws.
The earth is warmed about 30 C by the gas blanket. Of the contributions
to this warming, water vapor is about 98%. CO2 is about 1.5%. Doubling
the CO2 concentration will change the reradiated energy by 1.5%. Since
the blackbody radiation goes as the temperature to the fourth power, the
increased CO2 will increase the earth's temperature by less than 0.1 C.
That's not the way things work.
.
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