The percentage of Americans who believe global warming is happening has dipped from 80 to 72 percent in the past year, according to a new Washington Post-ABC News poll, even as a majority still support a national cap on greenhouse gas emissions.
The poll's findings -- which also show that 55 percent of respondents think the United States should curb its carbon output even if major developing nations such as China and India do less -- suggest increasing political polarization around the issue, just as the Obama administration and congressional Democrats are intensifying efforts to pass climate legislation and broker an international global warming pact.
The increase in climate skepticism is driven largely by a shift within the GOP. Since its peak 3 1/2 years ago, belief that climate change is happening is down sharply among Republicans -- 76 to 54 percent -- and independents -- 86 to 71 percent. It dipped more modestly among Democrats, from 92 to 86 percent. A majority of respondents still support legislation to cap emissions and trade pollution allowances, by 53 to 42 percent.