Have to hand it to CNN - which looks like the first major US news organization with the cajones to declare 'Global Warming is the real deal.'. 

This of course clashes with official government policy, which is that global warming is a myth perpetuated by tree-hugging enivronmentalists in order to deprive Americans of their constitutional right to guzzle gas - which would deprive Exxon and Saudi Arabia of their constitutional right to make lots of money.  

So don't bet on the US signing Kyoto or ever showing any leadership on the issue. It's up to you and me.