No the US hasn't signed on. I believe the some politician called Kyoto

“a socialist scheme to suck money out of the rich nations and into the poor ones.”

Something like that
harris7 Reviewed by harris7 on . Edwards: Global Warming Will Make World War Look Like Heaven Edwards: Global Warming Will Make World War Look Like Heaven Live Leak Wednesday, March 14, 2007 Edwards on Global Warming: 'This is an emergency' 'It's a frightening thing' 'It'll make world war look like heaven'. Effectively Edwards is saying global warming will kill more than 19 million people. Hysterical? An exaggeration? Noooooooo......you can trust this Bilderberger. Rating: 5