A man stands in a fountain in Washington Square Park on July 18, in New York City. Temperatures were expected in the upper 90's during another heat wave in the city. Mario Tama/Getty Images hide caption

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Mario Tama/Getty Images

When Heat Kills: Global Warming As Public Health Threat

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John Rohlfing, 38, takes a drink as he works on the construction of his new home Thursday in North Aurora, Ill. He started at 6:00 a.m. and quit at 11:00 a.m. because of triple-digit temperatures. Robert Ray/AP hide caption

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Robert Ray/AP

In Silver Spring, Md., on Monday, Matt MacCartney was one of many workers dismantling fallen trees that took down power lines. Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images

Dealing with the dog days: This pooch in Manhattan found one way to stay cool Thursday (July 21, 2011). Timothy A. Clary /AFP/Getty Images hide caption

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Timothy A. Clary /AFP/Getty Images

Christopher Joyce

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Volunteer John Kelley (left) leads an exercise class at a senior center in Oklahoma on Monday. Centers such as these offer seniors a cool place to go during heat waves. Sue Ogrocki/AP hide caption

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Sue Ogrocki/AP