Same goes for you, Neil -
Why do you ignore water vapor as a greenhouse gas, and why do you not count the variability of the Sun?
Given that a) water vapor is at least twice as effective as carbon dioxide as a greenhouse gas, and b) there's approximately 17.2 times as much water vapor as there is carbon dioxide in the atmosphere, I'd say the first part of that question is a rather important one. It goes without saying that the second part is also important, as it's been shown that the Sun does influence temperatures here on this Earth.
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