This is important because cloudiness is nonlinearly related to global warming - in smaller amounts clouds decrease warming by reflecting sunlight, while in larger amounts they increase warming by acting as an insulator (folks like me who live in the desert are experienced with the absence of this effect).
This suggests that there is a heretofore unknown avenue for non-anthropogenic non-linear global warming and cooling.
I wonder why this wasn't dreamed up for the Kyoto Protocol. Oh yes, that's right, it's because they don't know everything about anything except what they need to impose on others.
Via New Scientist.