Environment

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ADVANCE FOR USE MONDAY, MAY 19, AND THEREAFTER - This combination of aerial photos shows the damage to homes and businesses on May 21, 2013, the day after a massive tornado hit Moore, Okla., top, and the same neighborhood under reconstruction on May 15, 2014, bottom. (AP Photo)

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ADVANCE FOR USE MONDAY, MAY 19, AND THEREAFTER - In this photo combination, a tornado-ravaged home stands in the distance beyond a twisted street sign on May 22, 2013, in Moore, Okla., top, and the lot is cleared and a new homes stand next door on May 8, 2014, bottom. Moore continues to rebuild in the wake of a massive tornado that tore through Oklahoma City suburb on May 20, 2013. (AP Photo/Charlie Riedel)

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ADVANCE FOR USE MONDAY, MAY 19, AND THEREAFTER - This aerial photo combination shows the damage to the Moore Medical Center Emergency Services on May 21, 2013, after a massive tornado hit Moore, Okla., the day before, top, and the same view on May 15, 2014, bottom. (AP Photo)

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ADVANCE FOR USE MONDAY, MAY 19, AND THEREAFTER - In this photo combination, Kevin Kressler carries away debris at his tornado-ravaged home on May 25, 2013, in Moore, Okla., top. Kressler stands for a photo in front of his new home on May, 8, 2014, bottom. Kressler was one of the first residents to move back to his neighborhood after a massive tornado on May 20, 2013, leveled blocks around him in the Oklahoma City suburb. (AP Photo/Charlie Riedel)

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ADVANCE FOR USE MONDAY, MAY 19, AND THEREAFTER - In this photo combination, Katie Thomas sorts through debris at a friend's tornado-ravaged daycare on May 21, 2013, in Moore, Okla., top. A concrete slab is all that remains of the shopping center that contained the daycare on May, 8, 2014, bottom. (AP Photo/Charlie Riedel)

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ADVANCE FOR USE MONDAY, MAY 19, AND THEREAFTER - In this photo combination, Rick Brown puts on a pair of boots after finding them in his tornado-ravaged home in Moore, Okla., on May 22, 2013, top, and sits on the now-cleared lot on May 8, 2014, bottom. Brown said construction should start soon on a new home to replace the one destroyed by the massive tornado that tore a wide swath through the Oklahoma City suburb on May 20, 2013. (AP Photo/Charlie Riedel)

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ADVANCE FOR USE MONDAY, MAY 19, AND THEREAFTER - This aerial photo combination shows the damage to a neighborhood on May 21, 2013, the day after a massive tornado hit Moore, Okla., top, and reconstruction continues in the neighborhood on May 15, 2014, bottom. (AP Photo)