The most obvious reason is that it simply can't pass. Prior to negotiation of Kyoto, the U.S. Senate passed a resolution saying the U.S. read more
Becoming president should have removed the second objection at least, but there have been no steps to ratify Kyoto and there will not be: it will, barring major events, expire soon. There are a lot of reasons not to sign the Kyoto Protocol. read more
Although the United States has been criticized for not ratifying the Kyoto Treaty, it is not without serious concerns and problems that President Bush and the Senate see in the Kyoto Treaty. read more