Many countries have signed Kyoto. The US signed Kyoto. That is far different than ratifying the treaty and making it law. That only a handful of countries have done.
Robert Novak: Kyoto: Still Signed
........President Bush's conviction that the one-sided Kyoto pact threatens prosperity here is not in doubt. While Kyoto will not be ratified while he is in the White House, there is no statute of limitations for diplomatic treaties. Accordingly, a future Democratic president—elected in 2004 or later—could push it through the Senate.
To prevent that, the U.S. would disavow Kyoto—unsign the treaty—prior to the United Nations global warming conference in Johannesburg beginning August 26. The plan, under Cheney's patronage, was to unsign Kyoto before the Johannesburg meeting and then submit it to the U.N. (as was done with the ICC). Bush disconnected from the Rome treaty establishing the ICC just before it went into effect.
Now that Rice has scuttled Kyoto unsigning plans, the global warming treaty at long last may go into effect at Johannesburg without U.S. approval. If Secretary of State Colin Powell insists on attending the conference, however, that could be interpreted as tacit American support. ..... http://www.cnn.com/2002/ALLPOLITICS/07/25/column.novak/