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Originally Posted by TheEnemy
That is assuming all warming is due to CO2 with no influence from the sun.
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You seem to be forgetting that there are a lot of feedback effects at work. To list just a few:
1) Water vapor also is a greenhouse gas. The amout of water vapor in the atmosphere depends on temperature (and other factors which don't change here). When added CO2 increases the temperature by dT, that increases the amount of water vapor, which increases the temperature by several times dT.
2) Dark land/sea surface absorbs more heat energy than reflective ice cover, so melting the Arctic ice increases warming.
3) As the Arctic land mass warms, melting the permafrost, additional amounts of methane & CO2 are released.
4) A large amount of CO2 is dissolved in ocean waters. The solubility is inversely dependent on temperature. As ocean waters warm (because you've removed that nice radiant barrier insulating ice cover), they hold less CO2, which goes into the atmosphere, increasing warming.
Quote:
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That is assuming all warming is due to CO2 with no influence from the sun.
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Which, as has been pointed out numerous times, is the case. The sun's output has not changed significantly for as long as we have accurate measurements.