> But I am not getting numbers comparable to yours. To go from my 12 m
> to your 70 requires a factor of only 6, meaning it would require the
> complete solar input for 624 days.
Your number of days is of the right magnitude, I thought the
spreadsheet calculation was so easy I would not make a silly mistake,
but well I did.
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.
And there dies my idea that all the ice melting in less than a century
(as suggested by Hansen) is close to what the enthalpy of melting
would allow. It might still be an out of this world notion, but then
for some other reason.
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