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CHINA, BEIJING - JUNE 13: A cyclist rides past a burning coal stove at an old neighborhood on June 13, 2008 in Beijing, China. The coal stoves are still used for cooking by Beijing's poorer residents and contribute to heavy pollution in China's capital. Beijing will host Games of the XXIX Olympiad from August 8 to 24, 2008. (Photo by Guang Niu/Getty Images)

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CHINA, BEIJING - JUNE 13: Residents burn a coal stove at an old neighborhood on June 13, 2008 in Beijing, China. The coal stoves are still used for cooking by Beijing's poorer residents and contribute to heavy pollution in China's capital. Beijing will host Games of the XXIX Olympiad from August 8 to 24, 2008. (Photo by Guang Niu/Getty Images)

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CHINA, BEIJING - JUNE 13: Beijing is shrouded with smog on June 13, 2008 in Beijing, China. The International Olympic Committee (IOC) has warned some outdoor events could be at risk at being postponed because of Beijing's poor air pollution. (Photo by Guang Niu/Getty Images)

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CHINA, BEIJING - JUNE 13: Beijing is shrouded with smog on June 13, 2008 in Beijing, China. The International Olympic Committee (IOC) has warned some outdoor events could be at risk at being postponed because of Beijing's poor air pollution. (Photo by Guang Niu/Getty Images)

Getty Images

CHINA, BEIJING - JUNE 13: Beijing is shrouded with smog on June 13, 2008 in Beijing, China. The International Olympic Committee (IOC) has warned some outdoor events could be at risk at being postponed because of Beijing's poor air pollution. (Photo by Guang Niu/Getty Images)

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Cars drive under polluted skies in Beijing Friday June 13, 2008. Organizers of the 2008 Beijing Olympics have promised clean air for the games, with plans to shut chemical plants and foundries while banning construction and taking half of the city's 3.3 million vehicles off the roads in the days leading up to the opening ceremony on Aug. 8. (AP Photo/Greg Baker)

AP

A woman crosses a street under polluted skies in Beijing Friday June 13, 2008. Organizers of the 2008 Beijing Olympics have promised clean air for the games, with plans to shut down chemical plants and foundries while banning construction and taking half of the city's 3.3 million vehicles off the roads in the days leading up to the opening ceremony on Aug. 8. (AP Photo/Greg Baker)

AP

Gene Banman, CEO of Zero Motorcycles Inc., with his all electric prototype in a park near the US Capitol as part of a showcase of new automotive technologies that can help reduce our dependence on oil June 12, 2008 in Washington, DC. With oil and gas prices expected to remain near record highs in the near future, rapid technological innovations in the transportation sector are critically important to help end our nation's addiction to oil and reduce global warming pollution. AFP PHOTO / TIM SLOAN (Photo credit should read TIM SLOAN/AFP/Getty Images)

AFP/Getty Images

A look under the hood of a prototype hybrid by the University of Delaware and AC Propulsions sits in a park near the US Capitol as part of a showcase of new automotive technologies that can help reduce our dependence on oil June 12, 2008 in Washington, DC. With oil and gas prices expected to remain near record highs in the near future, rapid technological innovations in the transportation sector are critically important to help end our nation's addiction to oil and reduce global warming pollution. . AFP PHOTO / TIM SLOAN (Photo credit should read TIM SLOAN/AFP/Getty Images)

AFP/Getty Images

The MILES ZX40S all elctric car has a 50-60 mile driving range sits in a park near the US Capitol as part of a showcase of new automotive technologies that can help reduce our dependence on oil June 12, 2008 in Washington, DC. With oil and gas prices expected to remain near record highs in the near future, rapid technological innovations in the transportation sector are critically important to help end our nation's addiction to oil and reduce global warming pollution. . AFP PHOTO / TIM SLOAN (Photo credit should read TIM SLOAN/AFP/Getty Images)

AFP/Getty Images