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A Pew poll in October found 57 percent of Americans felt there was evidence that the earth was warming, down from 71 percent in April 2008. But only 36 percent attributed this to human activities, compared with 47 percent last year.

TOUGH SELL, ELECTORAL RISKS

This makes the task of selling legislation to the U.S. public to cap emissions more difficult.

Getting legislation to this effect next year in the U.S. Senate is high on Obama's agenda. The House of Representatives has narrowly passed its own version and

Republicans see opportunities here in next year's congressional contests when the Democrats will be fighting to maintain their majorities.

In the House of Representatives, Republican strategists have said that Harry Teague of New Mexico and Betsy Markey of Colorado are among the many Democrats seen vulnerable on this issue in 2010.

In the 100-seat Senate, some Democrats who are up for reelection next year will be in a bind on the issue, much as some are now with the healthcare debate.

"If the Senate does vote on climate change at some point next year, certainly Sens. Barbara Boxer (California), Michael Bennet in Colorado, Blanche Lincoln in Arkansas, Arlen Specter in Pennsylvania and Harry Reid in Nevada could all be vulnerable, depending, of course, on how they vote," said Jennifer Duffy of the nonpartisan Cook Political Report.

Senator Joseph Lieberman, an independent, said on Thursday negotiators in the Senate are nowhere close to writing details of a compromise climate change bill and that