Environment

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In this May 15, 2014 photo, trash litters a forested area on the shores of Guanabara Bay in Rio de Janeiro, Brazil. The country will not make good on its commitment to clean up Rio de Janeiro's sewage-filled Guanabara Bay by the 2016 Olympic Games. Authorities pledged to cut by 80 percent the flow of pollution into Guanabara Bay by the 2016 Games through the expansion of the sewage network and the construction of River Treatment Units, or RTUs, built at the mouths of rivers flowing into the bay. The facilities would filter out much of the sewage and trash. But little progress has been made on either front. (AP Photo/Felipe Dana)

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In this May 15, 2014 photo, kids play in the polluted waters of Guanabara Bay in Rio de Janeiro, Brazil. Little progress has been made in the clean up of the bay, and with just over two years to go until the Olympics, nearly 70 percent of the sewage in the metropolitan area of 12 million inhabitants continues to flow untreated, along with thousands of tons of garbage daily, into area rivers, the bay and even Rio's famed beaches like Copacabana and Ipanema. (AP Photo/Felipe Dana)

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In this May 15, 2014 photo, trash floats on a polluted water channel that flows into the Guanabara Bay in Rio de Janeiro, Brazil. With just over two years to go until the Rio Olympics, nearly 70 percent of the sewage in the metropolitan area of 12 million inhabitants continues to flow untreated, along with thousands of tons of garbage daily, into area rivers, the bay and even Rio's famed beaches like Copacabana and Ipanema.Several Olympic sports federations raised fears that Rio's polluted waters could prove harmful to athletes' health. Exposure to fecal matter can cause Hepatitis A, dysentery, cholera other diseases. (AP Photo/Felipe Dana)

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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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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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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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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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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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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)