Environment

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An Exxon sign at a mini-mart in Dormont, Pa. Exxon Mobil Corp. is fighting against government investigators who believe the company covered up knowledge of how fossil fuels contribute to climate change in this April 29, 2014 file photo. Exxon went to state court in Texas on Wednesday, April 13, 2016, to seek to quash a subpoena issued last month by the attorney general of the U.S. Virgin Islands. The company says the investigation violates its constitutional rights to speak freely and to be protected from unreasonable searches and seizures.(AP Photo/Gene J. Puskar, File)

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A painting depicting children eating ice cream is seen behind Republican presidential candidate, Ohio Gov. John Kasich as he eats chocolate ice cream during a visit to You Scream Ice Cream in Catonsville, Md., Wednesday, April 13, 2016. (AP Photo/Patrick Semansky)

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Joint Space Exploration Illustration by Greg Groesch/The Washington Times

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Coffee County of the Alabama Emergency Management Agency Deputy Director James Brown speaks to media in Enterprise, Ala., Saturday, March 26, 2014. Brown said four people were killed in an ambulance helicopter crash in southeast Alabama. (Jay Hare/Dothan Eagle via AP) ** FILE **

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Ohio Gov. John Kasich, Republican presidential candidte

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FILE - In this March 23, 2016, file photo, an aerial view is seen from a military plane carrying international journalists of the Taiwan-controlled Taiping island, also known as Itu Aba, in the Spratly archipelago, roughly 1600 kms. (1000 miles) in the South China Sea of southern Taiwan. Tensions in the South China Sea are rising, pitting China against smaller and weaker neighbors who all lay claim to a string of isles, coral reefs and lagoons, rich in fish and potential gas and oil reserves. (AP Photo/Johnson Lai, File)

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British biotech company Oxitec has genetically programmed male mosquitoes to produce offspring that die before adulthood. (Associated Press)

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An Oxitec technician inspects genetically modified Aedes aegypti mosquitoes, which are a vector for transmitting the Zika virus. The pupae of the male mosquitoes are designed not to mature to the point of reproduction. Tests have been planned for part of Florida. (Associated Press Photographs)

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Attorney General Loretta Lynch told the Senate Judiciary Committee that her department has discussed pursuing civil charges against the "climate denial scheme," as Sen. Sheldon Whitehouse, Rhode Island Democrat, put it. (Associated Press)

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U.S. Customs and Border Protection Air and Marine agents patrol along the Rio Grande on the Texas-Mexico border on Feb. 24, 2015, near Rio Grande City, Texas. (Associated Press)

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Donald Trump used the Colorado outcome to fire up his backers by blasting the state GOP for its "crooked" and "totally unfair" process. (Associated Press)

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Heavy clouds and rain pass over downtown Los Angeles on Friday, April 8, 2016. The first of two weather systems has brought showers to Southern California but rainfall has been scattered and mostly light. The National Weather Service says radar shows showers running across the region early Friday but not much of the rain is reaching the ground. (AP Photo/Richard Vogel)