"But Gore also acknowledged that one reason the Senate balked at ratifying the Kyoto Treaty was because other major emitters in the world had no obligations to cut back.  ‘The very fact that developing countries like Brazil, Indonesia, China -- which is in its own category -- have begun to take steps,' Gore said, ‘I think that makes it a very different situation.'  Since Kyoto, China has overtaken the United States as the world's largest emitter of carbon dioxide."