Environment

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The Deepwater Horizon oil rig can be seen burning in the Gulf of Mexico off the coast of Louisiana on April 21, 2010. (Associated Press)

Flood-affected people queue for relief supplies in Nowshera in northwest Pakistan on Friday, Aug. 6, 2010. Stormy weather grounded helicopters carrying emergency supplies to Pakistan's flood-ravaged northwest Friday as the worst monsoon rains in decades brought more destruction to a nation already reeling from Islamist violence.(AP Photo/Mohammad Sajjad)

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Pakistani boys drink water at a place destroyed by heavy flooding in Nowshera in northwest Pakistan on Friday, Aug. 6, 2010. Stormy weather grounded helicopters carrying emergency supplies to Pakistan's flood-ravaged northwest Friday as the worst monsoon rains in decades brought destruction. (AP Photo/Mohammad Sajjad)

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U. S. Chinook helicopters arrive in Kalam, Pakistan to evacuate stranded tourists on Thursday, Aug. 5, 2010.The floods have already killed an estimated 1,500 people over the past week, most of them in the northwest, the center of Pakistan's fight against al-Qaida and the Taliban. An estimated 4.2 million Pakistanis have been affected, including many in eastern Punjab province, which has seen numerous villages swallowed by rising water in recent days. (AP Photo/Sherin Zada)

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Pakistani children who fled their village due to heavy flooding sit with their pets in Mehmud Kot near Multan in central Pakistan on Friday, Aug. 6, 2010. Stormy weather grounded helicopters carrying emergency supplies to Pakistan's flood-ravaged northwest Friday as the worst monsoon rains in decades brought more destruction to a nation already reeling from Islamist violence.(AP Photo/K.M.Chaudary)

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A Pakistani villager drags his cot in a house flooded in Mehmud Kot, near Multan, in central Pakistan on Friday, Aug. 6, 2010. Stormy weather grounded helicopters carrying emergency supplies to Pakistan's flood-ravaged northwest Friday as the worst monsoon rains in decades brought more destruction to a nation already reeling from Islamist violence.(AP Photo/K.M.Chaudary)

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Flood-affected people jostle for food relief in Nowshera in northwest Pakistan on Friday, Aug. 6, 2010. Stormy weather grounded helicopters carrying emergency supplies to Pakistan's flood-ravaged northwest Friday as the worst monsoon rains in decades brought more destruction to a nation already reeling from Islamist violence.(AP Photo/Mohammad Sajjad)

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Volunteers load bottles of drinking water for flood-affected people in a U.S. Army helicopter at Ghazi base, 56 miles from Islamabad, Pakistan on Friday, Aug. 6, 2010. Over the last week, floods have spread from the northwest down Pakistan, killing around 1,500 people and affecting more than 4 million. (AP Photo/Nabeel Johnson)

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Pakistani villagers evacuate an elderly person with the help of a Pakistan Navy crewman from flooded areas at Toree Band, in the Kashmor district, near Sukkar, in Pakistan's Sindh province, Friday, Aug. 6, 2010. Stormy weather grounded helicopters carrying emergency supplies to Pakistan's flood-ravaged northwest Friday as the worst monsoon rains in decades brought more destruction to a nation already reeling from Islamist militant violence. (AP Photo/Shakil Adil)

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Pakistani villagers from flooded areas are seen after being rescued by the Pakistani Navy at Toree Band, in the Kashmor district, near Sukkar, in Pakistan's Sindh province, Friday, Aug. 6, 2010. Stormy weather grounded helicopters carrying emergency supplies to Pakistan's flood-ravaged northwest Friday as the worst monsoon rains in decades brought more destruction to a nation already reeling from Islamist militant violence. (AP Photo/Shakil Adil)

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Flood-affected people jostle for food relief in Nowshera in northwest Pakistan on Friday, Aug. 6, 2010. Stormy weather grounded helicopters carrying emergency supplies to Pakistan's flood-ravaged northwest Friday as the worst monsoon rains in decades brought more destruction to a nation already reeling from Islamist violence.(AP Photo/Mohammad Sajjad)

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People walk across an area damaged by flash floods in Leh, in Indian-controlled Kashmir's normally arid, mountainous region of Ladakh, Friday, Aug. 6, 2010. The sudden overnight downpour and flash floods swept away houses and killed dozens of people, officials said Friday. (AP Photo/Josh Schrei)

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Debris from the Mount Karangetang volcano lies on the shoulder of the mountain in Siau, part of Indonesia's Sulawesi island chain , in this July 27, 2006, file photo. A disaster official said Mount Karangetang spewed lava and hot ash hundreds of yards into the air on Friday Aug. 6, 2010. Mount Karangetang is located on Siau, part of the Sulawesi island chain. (AP Photo/Arter, File)

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Graphic compares the BP oil spill with other sources of oil in the Gulf of Mexico, such as natural seepage and leaks

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ASSOCIATED PRESS A tree is uprooted in the yard of a home that is for sale in the Del Ray neighborhood of Alexandria, Va. after storms caused damage and power outages, Thursday, Aug. 5, 2010.

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Haiti's presidential candidate and hip hop singer Wyclef Jean, left, talks to a local journalist in Croix de Bouquets, Haiti, Thursday, Aug. 19, 2010. Haitian President Rene Preval met with presidential hopeful Wyclef Jean for more than two hours on Thursday, touching off a new round of speculation as to whether the singer will be allowed to run in Nov. 28 elections. (AP Photo/Ramon Espinosa)

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A family trapped by heavy flooding is evacuated with other residents on a Pakistani army helicopter in Sanawan near Multan in central Pakistan on Thursday, Aug. 5, 2010. Flood survivors loaded down with possessions fled a growing deluge in Pakistan's most populous province Thursday as the government came under renewed criticism for its response to the worst monsoon rains in decades. (AP Photo/Khalid Tanveer)