Environment

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Firefighters walk through an area of exploded propane cylinders in the aftermath of an explosion and fire at a propane gas company, Tuesday, July 30, 2013, in Tavares, Fla. (AP Photo/John Raoux)

**FILE** New U.S. Environmental Protection Agency Administrator Gina McCarthy delivers a speech at Harvard Law School in Cambridge, Mass., on July 30, 2013. During her speech, the first as the head of the EPA, McCarthy told an audience that curbing climate-altering pollution will strengthen the economy. (Associated Press)

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This frame grab from an Associated Press video shows flames from a gas plant explosion in Tavares City, Fla., Monday, July 29, 2013. A series of major explosions at has injured several workers and left others missing. (AP Photo)

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"We have resources, oil, gas. Surprisingly there is only one American company engaged in gas exploration,” said Liberata Mulamula, Tanzanian ambassador. (Andrew S. Geraci/The Washington Times)

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**FILE** A farm worker prepares a tomato field for planting at K&D Farmers near Oneonta, Ala., on May 10, 2012. (Associated Press)

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Construction vehicles and lots of dirt go on for miles while traffic crawls on Interstate 95 in Northern Virginia while HOT lanes are built near Dumfries. AAA calls the project "an essential fix to help alleviate traffic in one of the worst bottlenecks on the entire East Coast." (Andrew Harnik/The Washington Times)

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** FILE ** Sand Tiger Shark (AP Photo/Michael Sohn)

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U.S. Marine Corps Cpl. Richard Sippl, a flight crew chief assigned to Marine Light Attack Helicopter Squadron (HMLA) 169, fires a 7.62 mm M134 Minigun. (Credit: Department of Defense)

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Lobsterman John Aldridge lies on a stretcher at Air Station Cape Cod in Sandwich, Mass., after being rescued by a Coast Guard helicopter, July 24, 2013. Aldridge, a fisherman for 19 years, fell overboard and spent 12 hours floating in the ocean south of Montauk, N.Y. before he was rescued. (AP Photo/US Coast Guard, Ross Ruddell)