Run "Global Warming" through the White House internal search engine and you link to a single document that questions the existence of the phenomenon. On the other hand, a google search for GW related documents housed at whitehouse.gov brings back over 400 hits. This change seems to have occurred in the last couple of weeks.
Meanwhile, a quick look at Government of Canada Climate Change page provides insight into the thinking of the ruling Tories on this issue. Oh Wait! It's blank, and has been since July 2006! Guess they haven't stolen any ideas from here yet.
h/t to James' Empty Blog.