Airiannys Milford listens to music on her iPad in the shade at South Pointe Park in Miami Beach, Fla., July 11, 2012. Alan Diaz/AP
A Syrian brown bear eats an ice block of frozen fruits, vegetables and fish to cool off from the heat at the Ramat Gan Safari near Tel Aviv, Israel, July 12, 2012. Ariel Schalit/AP
Suzannah McMillin plays in a public fountain to cool off on July 10, 2012, while visiting the Vacaville, Calif., Cultural Center. Rick Roach/The Vacaville Reporter/AP
As overcast skies move in, Eric Vandeven and his son Braxton, enjoy the relatively cooler temperatures in their backyard pool, July 8, 2012, in Imperial., Mo. 'The temperature just dropped, not by much, but you can feel it. It sure looks like it will rain,' said Vandeven. 'My backyard grass could sure use it,' he added. Laurie Skrivan/St. Louis Post-Dispatch/AP
Contractor Donald Outland wipes the sweat from his eyes while he and a crew of fellow road workers from APAC dig out a dangerous wrinkle in the asphalt on July 9, 2012, in Memphis, Tenn. Jim Weber/The Commercial Appeal/AP
Greater Spokane County Meals on Wheels client Lawrence Rowse uses a fan to keep his home cool, July 9, 2012, in Spokane Valley, Wash. With a heat wave upon the area, Meals on Wheels needs people to donate fans that they can deliver to seniors, who are particularly at risk of heat stroke and dehydration. Colin Mulvany/The Spokesman-Review/AP
A boy eats an ice cream cone on Monday, July 2, 2012, at Seattle's Alki Beach Park. Elaine Thompson/AP
Lindsey Cote and her son Dylan Cote stand beside a giant fan inside Fullsteam for the 'Fullsteam's Olde Timey Funday,' during a hot Sunday, July 1, 2012, as temperatures rose over 100 degrees for the third day in a row in Durham N.C. Bernard Thomas/The Herald-Sun/AP
Gary Gearheart swings on a rope swing with Anyia Cooper, into the Roanoke River near Wasena Park in Roanoke, Va., on Friday, June 29, 2012. Temperatures in Roanoke climbed over 100 degrees, the first 100-plus-degree June day for Roanoke in 53 years, according to The Roanoke Times. Kyle Green/The Roanoke Times/AP
Connor Stanley, 10, of Garner, N.C. cools off in front of a misting fan after completing the Raleigh's FINEST 5K race on Saturday, June 30, 2012. 'I sweated through the whole race,' he said. 'I thought that I was going to throw up.' Despite the soaring temperatures and high humidity, 312 participants in the Raleigh's FINEST 5K turned out at Fire Station Six in Raleigh for the fundraiser. Corey Lowenstein/The News & Observer/AP
A honeybee takes a drink from a fountain on the campus of the Southeastern Baptist Theological Seminary in Wake Forest, N.C., on Sunday, July 1, 2012. The temperature was forecast to top 100 degrees for the third day in a row. Allen Breed/AP
One man rests in the shade while another plays handball during a warm afternoon at a playground in the Bay Ridge section of Brooklyn in New York, on June 30, 2012. Temperatures reached the 90's in the city. Peter Morgan/AP
James Linderman catches water from the spillway at Buck Creek Park to cool off from record heat in Helena, Ala., on Friday, June 29, 2012. Bernard Troncale/The Birmingham News/AP
People crowd at the beach at Coney Island in Brooklyn, on June 30, 2012. About 3.9 million homes and businesses were without power on Saturday amid a record heat wave in the eastern United States after deadly thunderstorms downed power lines from Indiana to New Jersey. Eric Thayer/Reuters
Cows whip their tails, splashing water overhead, while cooling off in a pond June 20, 2012, in Bradfordton, Ill. The official start of summer brought temperatures in the high 90s, record-setting in some spots and awfully close in others, to the Eastern seaboard. Seth Perlman/AP
Jashanté Holland, 9, dips and swings Aaliyah Stanley, 3, in the middle of the fun wagon sprinkler at Woodside Village in Danville, Va., June 20, 2012. Steven Mantilla/Register & Bee/AP
Children play in the fountain at Circus Square Park on June 19, 2012, in Bowling Green, Ky. Alex Slitz/Daily News/AP
Youngsters shed their shoes to cool their feet in running water at The High Line park in New York City on June 21, 2012. Richard Drew/AP
Dillon Davis of Washington, tries to catch some water from a fountain at Georgetown Waterfront Park, in Washington D.C., June 20, 2012. Jacquelyn Martin/AP
Thousands of yoga enthusiasts convene in New York's Times Square to mark the summer solstice, June 20, 2012. Mark Lennihan/AP
Kids jump, play and swim in a pool on June 20, 2012, in Philadelphia. Temperatures climbed toward the high 90s along the Eastern Seaboard as an unusually early hot spell heralded the official start of summer. Brynn Anderson/AP
Wyatt Taylor and Marci Hohner lay in the sun as geese surround them Wednesday, June 20, 2012, in Portland, Ore. Rick Bowmer/AP
A young girl falls backward into the water at the Astoria Park Pool in New York on July 21, 2011. Lucas Jackson/Reuters
William Dyer Jr. of Gortham, Maine, stays cool seated on his beach chair waist-deep in Sabbathday Lake in New Gloucester, Maine, on July 21, 2011. Robert F. Bukaty/AP
Vanity Mendez, 11 (l.), Isaiah Rivera, 6 (c.), and Jonathan Medina, 11, cool off at an open fire hydrant in the East Village neighborhood of Manhattan on July 21, 2011. Mary Altaffer/AP
Bosnians seek refreshment under artificial waterfalls in the Bosnian town of Tuzla on Aug 25, 2011. Amel Emric/AP
A man bathes in water from a roadside pipe in Allahabad, India, on May 25, 2011. Rajesh Kumar Singh/AP
A man cools off at a fountain in Rome on July 16, 2010. Gregorio Borgia/AP
A man cools off in a waterfall in Minsk, Belarus, on July 15, 2010. Sergei Grits/AP
Children enjoy the fountain on the plaza at the Christian Science Center in Boston, Mass.
Girls cool off at a fountain near the Berlin Cathedral in the Lustgarten Park in Berlin.
People cool off in the Berounka River in the village of Dobrichovice near Prague. David W Cerny/Reuters
An Asian elephant sprays water as it cools off at the National Zoo in Washington D.C. Charles Dharapak/AP
Jose Vega and his nephew Nazeah Torres cool off in the sprinklers at Clasky Common Park in New Bedford, Mass.
Juwuan Patterson and Sakinah Reed cool off in the spray of an open hydrant at 87th Street and Burley Avenue in Chicago.
DeQoreon Love (l.) and JaCorren Love cool off in the water in front of their house on Merton St. in Memphis, Tenn. Alan Spearman/The Commercial Appeal/AP
People cool off in the water-jets of a waterfall in Minsk, Belarus. Sergei Grits/AP
Children cool off in a inflatable pool on the street in an effort to combat a heat wave in the Brooklyn section of New York. Jessica Rinaldi/Reuters
Brothers Mohammed (l.) and Yousef Othman try to cool off while playing in the water fountains at Dundas Square in Toronto, Ontario. Darren Calabrese/The Canadia Press/AP
Residents crowd in a swimming pool to escape the summer heat during a hot weather spell in Daying County, Suining, Sichuan Province, China. Reuters
Ervin Holmes plays with his daughter in the lake at Paul B. Johnson State Park on July 5 near Hattiesburg, Miss. Matt Bush/Hattiesburg American/AP
Stefan Sidorowicz of Hamtramck floats along the Detroit River off Belle Isle as temperatures climbed above the mid-90s in Detroit. Andre J. Jackson/Detroit Free Press/AP
People cool of from the heat of the day under water sprayed from a fire engine in Philadelphia, Pa. Matt Rourke/AP
A child plays at a swimming pool during a heat wave in Wuhan, China. Reuters
A girl jumps in a lake in Salzburg, Austria. Kerstin Joensson/AP
Hail pummels downtown Bozeman, Mont. Erik Petersen/Bozeman Daily Chronicle/AP
US scientists warned that heat stress-related labor capacity losses will double globally by 2050 if the Earth's temperature rises by another 1.8 degrees F.
Earth's increasingly hot, wet climate has cut the amount of work people can do in the worst heat by about 10 percent in the past six decades, and that loss in labor capacity could double by mid-century, U.S. government scientists reported on Sunday.
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