Environment

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ADVANCE FOR SATURDAY APRIL 12 AND THEREAFTER - Cory Klehm, right, Fairfield Middle School science teacher, hands out pea sprouts to Fairfield Middle School sixth grader Mark Adler,12, during a visit to a greenhouse Friday, APRIL 4, 2014 in Fairfield, Iowa. The greenhouse uses waste heat from nearby Schaus-Vorhies Kleaning Inc. The recycled waste heat may be the first use of it's kind in an Iowa greenhouse. (AP Photo/The Register, Christopher Gannon) MAGS OUT, TV OUT, NO SALES, MANDATORY CREDIT

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ADVANCE FOR SATURDAY APRIL 12 AND THEREAFTER - Fairfield Middle School sixth grader Jaya Coplea, 12, left, nibbles on a spinach leaf during a visit to a greenhouse Friday, April 4, 2014 in Fairfield, Iowa. The recycled waste heat may be the first use of it's kind in an Iowa greenhouse. (AP Photo/The Register, Christopher Gannon) MAGS OUT, TV OUT, NO SALES, MANDATORY CREDIT

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FILE - In this June 10, 2010 file photo, a Kemp’s ridley sea turtle is lifted back to its temporary tank after being weighed, getting its heartbeat and temperature taken, and getting a shot of antibiotics at the Audubon Nature Institute’s Aquatic Center in New Orleans. A week-long international sea turtle conference is gearing up in New Orleans. Starting Monday, April 14, 2014, more than 600 experts from around the globe will be discussing research done as near as the Gulf of Mexico and as far as Tanzania at the International Sea Turtle Society’s 34th annual symposium on sea turtle biology and conservation. (AP Photo/Janet McConnaughey, File)

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ADVANCE FOR SUNDAY APRIL 13 AND THEREAFTER- In this Tuesday March 25, 2014 photo, farmer Bill Grantham poses for a photo at his farm in Kearneyville, W.Va. Grantham said demand is high locally for eggs raised on non-genetically modified corn. He charges $5 for a dozen eggs at area farmers’ markets and routinely sells out. (AP Photo/Spirit of Jefferson and Farmer's Advocate, Randy Snyder)

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A man fishes on the Guanabara Bay in Rio de Janeiro, Brazil, Thursday, April 10, 2014. Many had hoped authorities tackle decades of neglect and poor planning that have blighted waterways, after Rio's Olympic committee pledged in writing that the pollution problems of Guanabara Bay will be fixed. (AP Photo/Silvia Izquierdo)

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A garbage-collecting barge gathers trash at the Guanabara Bay in Rio de Janeiro, Brazil, Thursday, April 10, 2014. The barge is one of three so-called "eco-boats," floating garbage vessels that are a key part of the authorities' pledge to clean up Rio’s devastated Guanabara Bay before the city – and the waterway itself – plays host to the 2016 Olympic games. (AP Photo/Silvia Izquierdo)

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Miami Heat's LeBron James, right, reacts as he talks with official Michael Smith during the second half of an NBA basketball game against the Indiana Pacers, Friday, April 11, 2014, in Miami. The Heat defeated the Pacers 98-86. (AP Photo/Lynne Sladky)

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FILE - This May 23, 2011 photo released by NASA shows the International Space Station at an altitude of approximately 220 miles above the Earth, taken by Expedition 27 crew member Paolo Nespoli from the Soyuz TMA-20 following its undocking. A computer outage at the International Space Station may require a spacewalk by astronauts and threatens to delay next week's launch of a commercial supply ship for NASA. NASA said Friday night April 11, 2014 that a backup computer on the outside of the orbiting lab is not responding to commands. (AP Photo/NASA, Paolo Nespoli)