I thought Bush was responsible!

Increased output from the Sun might be to blame for 10 to 30 percent of global warming that has been measured in the past 20 years, according to a new report.

Increased emissions of carbon dioxide and other heat-trapping gases still play a role, the scientists say.

But climate models of global warming should be corrected to better account for changes in solar activity, according to Nicola Scafetta and Bruce West of Duke University.

The findings were published online this week by the journal Geophysical Research Letters.