Environment

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New Jersey Gov. Chris Christie answers questions during a news conference on Thursday to address the bridge scandal. Republicans came to Mr. Christie's defense, praising his willingness to take responsibility for the incident and to hold those at fault accountable for their actions. (Associated Press photographs)

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Relatives pray next to a cross in remembrance of family members who died in the 2010 earthquake during a memorial service in Titanyen, north of Port-au-Prince, Haiti, Sunday, Jan. 12, 2014. Haitians are pausing to remember the tens of thousands of people who died in the 7.0-magnitude earthquake that struck outside Haiti's capital on Jan. 12, 2010. The quake left 1.5 million people living in tent camps. Officials say more than 300,000 died, but no one knows for certain how many people lost their lives. (AP Photo/Jean Marc Herve Abelard)

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Relatives attend a memorial service honoring family members who died in the 2010 earthquake during a memorial service in Titanyen, north of Port-au-Prince, Haiti, Sunday, Jan. 12, 2014. Haitians are pausing to remember the tens of thousands of people who died in the 7.0-magnitude earthquake that struck outside Haiti's capital on Jan. 12, 2010. The quake left 1.5 million people living in tent camps. Officials say more than 300,000 died, but no one knows for certain how many people lost their lives. (AP Photo/Jean Marc Herve Abelard)

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Relatives walk to a hilltop, where they will place a cross, in remembrance of those family members who died in the 2010 earthquake, prior to a memorial service in Titanyen, north of Port-au-Prince, Haiti, Sunday, Jan. 12, 2014. Haitians are pausing to remember the tens of thousands of people who died in the 7.0-magnitude earthquake that struck outside Haiti's capital on Jan. 12, 2010. The quake left 1.5 million people living in tent camps. Officials say more than 300,000 died, but no one knows for certain how many people lost their lives. (AP Photo/Jean Marc Herve Abelard)

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Haiti's President Michel Martelly, left, and first lady Sophia Martelly, center, place a bouquet of flowers at a monument in memory of the victims of the 2010 earthquake, during a memorial service at Titanyen, a mass burial site for earthquake victims, north of Port-au-Prince, Haiti, Sunday, Jan. 12, 2014. Martelly's government issued a decree declaring Jan. 12 a day of remembrance and reflection. The Haitian flag is being flown at half-staff, and clubs are to remain closed. (AP Photo/Jean Marc Herve Abelard)

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Local residents in Charleston, W.V. continue to arrive at distribution centers to load up on bottled water Sunday, Jan. 12, 2014 after a chemical spill Thursday in the Elk River that has contaminated the public water supply in nine counties. Frustration is mounting for many of the 300,000 West Virginia residents who've gone three days without clean tap water. (AP Photo/Michael Switzer)

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Local residents brought empty containers and coolers to distribution centers across Kanawha County (W.Va.) Sunday morning, Jan. 12, 2014 to fill with water after a chemical spill Thursday in the Elk River that has contaminated the public water supply in nine counties. Frustration is mounting for many of the 300,000 West Virginia residents who've gone three days without clean tap water. (AP Photo/Michael Switzer)

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Local businesses remain closed and unable to serve food and water InCharleston, W.V., Sunday, Jan. 12, 2014 after a chemical spill Thursday in the Elk River that has contaminated the public water supply in nine counties. Frustration is mounting for many of the 300,000 West Virginia residents who've gone three days without clean tap water. (AP Photo/Michael Switzer)

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Local law enforement officials assist residents lining up at distribution centers in Charleston, W.V., Sunday morning, Jan. 12, 2014 to fill coolers and other containers after a chemical spill Thursday in the Elk River contaminated the public water supply in nine counties. Frustration is mounting for many of the 300,000 West Virginia residents who've gone three days without clean tap water. (AP Photo/Michael Switzer)

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Local residents lined up outside the Charleston Fire Department Sunday morning, Jan. 12, 2014 to pick up bottled water in Charleston, W.Va. This is one of many locations handling distribution of bottled water as the ban on using tap water for drinking and washing continues following the chemical spill Thursday in the Elk River that has contaminated the public water supply in nine counties. (AP Photo Michael Switzer)

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Water buffaloes are made available to local residents in South Charleston, W.V. to fill coolers and other containers at the GeStamp Stamping Plant-South Charleston Sunday morning, Jan. 12, 2014. The ban on using water for drinking, washing and cleaning remains in effect following the chemical spill Thursday in the Elk River that has contaminated the public water supply in nine counties. (AP Photo Michael Switzer)

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South Charleston Public Works employees assist local residents in South Charleston, W.V. in obtaining bottled water at the GeStamp Stamping Plant-South Charleston (W.Va.) distribution location Sunday morning, Jan. 12, 2014. This location will remain open 24-hours a day until the ban on using tap water for drinking and washing is lifted. The ban has been in effect following the chemical spill Thursday in the Elk River that has contaminated the public water supply in nine counties.. (AP Photo Michael Switzer)

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South Charleston Public Works employees assist local residents in South Charleston, W.V. in obtaining bottled water at the GeStamp Stamping Plant-South Charleston (W.Va.) distribution location Sunday morning, Jan. 12, 2014. This location will remain open 24-hours a day until the ban on using tap water for drinking and washing is lifted. The ban has been in effect following the chemical spill Thursday in the Elk River that has contaminated the public water supply in nine counties.. (AP Photo Michael Switzer)

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The GeStamp Stamping Plant-South Charleston (W.Va.) is one of several distribution locations open Sunday morning, Jan. 12, 2014 so local residents can pick up bottled water and fill containers after a chemical spill Thursday in the Elk River that has contaminated the public water supply in nine counties. Frustration is mounting for many of the 300,000 West Virginia residents who've gone three days without clean tap water..This location will remain open 24-hours a day until the ban on using tap water for drinking and washing is lifted. (AP Photo Michael Switzer)

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Local residents in South Charleston (W.Va) brought empty containers, coolers and other items to distribution centers Sunday morning, Jan. 12, 2014 to fill with water after a chemical spill Thursday in the Elk River that has contaminated the public water supply in nine counties. Frustration is mounting for many of the 300,000 West Virginia residents who've gone three days without clean tap water.. The ban on using tap water for drinking and washing is still in effect following the chemical spill on Thursday, January 9, 2014. (AP Photo Michael Switzer)

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Employees of the South Charleston Public Works Department assisted the residents in obtaining cases of water and filling the containers they brought with them Sunday, Jan. 12, 2014 after a chemical spill Thursday in the Elk River that has contaminated the public water supply in nine counties. Frustration is mounting for many of the 300,000 West Virginia residents who've gone three days without clean tap water.The West Virginia National Guard was sent to help distribute bottled water. (AP Photo Michael Switzer)

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Local residents in Charleston, W.V. continue to arrive at distribution centers to load up on bottled water Sunday, Jan. 12, 2014 after a chemical spill Thursday in the Elk River that has contaminated the public water supply in nine counties. Frustration is mounting for many of the 300,000 West Virginia residents who've gone three days without clean tap water. (AP Photo/Michael Switzer)

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In this July 2007 photo, fireworks exploding over Lake Tahoe are seen from Heavenly Mountain Resort. A federal lawsuit accusing the Lake Tahoe Visitors Authority of polluting the alpine lake with debris from Fourth of July and Labor Day fireworks says the authority and its contractor should be subject to up to $75 million in fines for thousands of violations of the Clean Water Act over the past five years. (AP Photo/The Tahoe Daily Tribune, Jonah M. Kessel)