Environment

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Former president George W. Bush and his wife, Laura, arrive April 25, 2013, at the dedication of the George W. Bush Presidential Center in Dallas. (Associated Press)

An electron microscope image provided by the Centers for Disease Control and Prevention shows the H7N9 virus which can take on a variety of shapes, April 15, 2013. Almost three weeks after China reported finding a new strain of bird flu in humans, experts are still stumped by how people are becoming infected when many appear to have had no recent contact with live fowl and the virus isn't supposed to pass from person to person. (Associated Press)

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The George W. Bush Presidential Center in Dallas, showing the monumental main entrance of the 17-acre site.

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A woman cuts weeds in a field near an unfinished real estate project in Chongqing, China, Tuesday, April 23, 2013. (AP Photo/Alexander F. Yuan)

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A man who was trapped in an eight-story building housing several garment factories is rescued after the structure collapsed in Savar, near Dhaka, Bangladesh, Wednesday, April 24, 2013. The building collapsed near Bangladesh's capital Wednesday morning, killing dozens of people and trapping many more in the rubble, officials said. (AP Photo/ A.M. Ahad)

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Head stonemason Joseph Alonso works from scaffolding constructed so repairs can be made on a spire at the Washington National Cathedral, damaged in the August 2011 earthquake. Sections of spires remain missing or damaged and some gargoyles and other pieces of stonework will need to be reattached.

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Head Stone Mason Joe Alonso looks up at a spire that broke apart and damaged the roof of the Washington National Cathedral during a 5.8 magnitude earthquake in August of 2011, Washington, D.C., Monday, April 22, 2013. (Andrew Harnik/The Washington Times)

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Jeanette Gregory of Prince William County, Va., center, take a photo of pieces of a stone spire that broke off the Washington National Cathedral during a 5.8 magnitude earthquake in August of 2011, Washington, D.C., Monday, April 22, 2013. (Andrew Harnik/The Washington Times)

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The head of a gargoyle and others pieces of stone that broke off the Washington National Cathedral during a 5.8 magnitude earthquake in August of 2011 are on display at the cathedral, Washington, D.C., Monday, April 22, 2013. (Andrew Harnik/The Washington Times)

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Champagne bottles dating back decades are on display inside the base of the central tower of the Washington National Cathedral during a tour on damage caused by the 5.8 magnitude earthquake in August of 2011, Washington, D.C., Monday, April 22, 2013. Former Head Stone Carver Vince Palumbo and his crew saved a bottle from each New Year celebration. (Andrew Harnik/The Washington Times)

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Champagne bottles dating back decades are on display inside the base of the central tower of the Washington National Cathedral during a tour on damage caused by the 5.8 magnitude earthquake in August of 2011, Washington, D.C., Monday, April 22, 2013. Former Head Stone Carver Vince Palumbo and his crew saved a bottle from each New Year celebration. (Andrew Harnik/The Washington Times)