Photo: Global Warming Likely Causing More Heat Waves, Scientists Say

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Workers clean a parking lot at the Illinois State Fair in Springfield as the heat index heads toward 109° Fahrenheit (43° Celsius). The extreme weather currently frying the U.S. Midwest is just one of several severe heat waves to strike Europe and the United States this summer.

Climate experts say it's a safe bet that global warming is causing more heat waves. But it's difficult to link any specific event to climate change, they caution.

AP Photo/Seth Perlman

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