> 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.
I am not sure what Michael means with "feedbacks included" on
reflection.
I am also not entirely sure what you are saying here, but I think it's
probably that the greenhouse gas water vapour is temperature dependent
and if all of the 4 W per m2 from CO2 go towards melting ice, then
none is available for increasing Earth's temperature and therefore the
concentration of water vapour stays contstant.
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