[email protected] wrote:
> I think the 4 W/m2 for CO2 do not include the water vapour and cloud
> feedbacks. So, for quadrupled CO2 (Hansen talks about all fossil fuels
> being burnt) we've got twice that plus feedbacks. For a climate
> sensitivity of 3C, the feedbacks are about a factor three. 4*2*3= 24 W/
> m2
> being available from CO2 four times pre-industrial.
I haven't followed all of the calculation in detail, but this is wrong.
It doesn't matter what the feedbacks are, 2xCO2 is still only 4W/m^2.
What the feedbacks do is change the amount by which the outgoing
radiation changes as the planet warms.
James
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