This is really quite lovely.  Congratulations to Raymond T. Pierrehumbert for using reason, good logic, and real numbers to refute some of the insanity around regarding climate issues.  A lovely example of numbers in defense of sanity.

http://www.realclimate.org/index.php/archives/2009/10/an-open-letter-to-steve-levitt/

I think the solar power area numbers he uses might be a little optimistic, but only by a factor of 2 or so, and not that it would drastically change the conclusion of the article.