Politics.

[frannyan]

"After six years of dodging the climate issue, the Bush administration is finally having to face it head on. A letter released by the White House on Wednesday claimed that "climate change has been a top priority since the president's first year in office" and that "President Bush has consistently acknowledged climate change is occurring and humans are contributing to the problem." Yes, really -- it said that. "

http://www.grist.org/news/muck/2007/02/09/bush/index.html?source=daily

Ah, Bush. Youthink we don't remember these things :)