Someone in the global warming research department forgot something... the sun! Yes, its true. Current global warming models apparently consider the global warming contribution of the sun's as constant over time (centuries). Apparently some people have a problem with this at www.space.com.
The reflectivity of the planet's surface (a thank's to my friend Rob for the heads up on this) is also not part of the model. Some things, like clouds, reflect more or less light than others.
As for the sun, well, suprise, its measurable output is increasing (a good reason to ignore it, I think). The apropo comment from the previous www.space.com link is Sun's possible influence has been largely ignored because it is so difficult to quantify over long periods. Hmmm...
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