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that is a priority for President Barack Obama and making some Democrats vulnerable in the November 2010 congressional elections.

America will pledge at U.N. climate talks in Copenhagen that begin next week to cut its greenhouse gas emissions, which most scientists say are the main agents of climate change, by 17 percent below 2005 levels by 2020.

In global scientific circles, that is seen as vital as America accounts for around a fifth of global emissions. But for some conservative U.S. activists it all seems sinister.

"We're not interested in one-world government, which seems to be the direction of this summit," said Dale Robertson, the founder of the Tea Party organization which has held rallies across the country to protest Obama's agenda.

A constant theme on conservative and Christian talk-radio stations, which reach tens of millions of Americans, is the notion that the global warming scare is a "hoax" aimed at crippling the U.S. economy and way of life.

This all strikes a chord in these tough economic times and opinion polls show Americans cooling to the issue.

A Washington Post-ABC News poll in November found that 72 percent of Americans surveyed believed global warming was happening, down from 80 percent last year.

But even among Americans who accept that temperatures are climbing there is reluctance to pin the blame on humans.