Environment

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An 1864 letter from Abe Lincoln from the White House is part of the $148,000 Mount Rushmore Collection, sold By the Raab Collection. (Raab Collection)

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Dr. Tom Frieden, director of the Centers for Disease Control and Prevention, is calling for a $1.8 billion project to combat Aedes aegypti. (Associated Press) **FILE**

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Mrs. Clinton's Democratic challenger, Sen. Bernie Sanders of Vermont, has put his campaign's money behind his commitment to fight climate change.

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Democratic presidential candidate Hillary Clinton told reporters last summer that she would pay to offset greenhouse gases from her campaign travels, but carbon offset providers say they have heard only silence. (Associated Press photographs)

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U.S. Patriot missiles are deployed in South Korea to respond to North Korea's nuclear testing. (Associated Press)

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Agriculture Secretary Tom Vilsack speaks Friday, Feb. 12, 2016, during an event at Fort Stewart, GA., announcing $720 million in conservation funding being awarded to 84 projects across the U.S. Fort Stewart, the largest Army post east of the Mississippi River, is receiving $2 million to assist its efforts to preserve more than 278,000 acres of longleaf pine forest that is home to endangered red-cockaded woodpeckers. (AP Photo/Russ Bynum)

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(Amazon)

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Illustration on the deteriorating economy by William Brown/Tribune Content Agency

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The satellite 'LISA Pathfinder' stands in a room of the 'Industry Plants Operating Company' (IABG) in Ottobrunn, Germany, on Sept. 1, 2015. The satellite will be taken to space in November 2015 to detect gravitational waves. (Sven Hoppe/dpa via AP) **FILE**

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Under army patrol, South Korean cargo trucks head to Kaesong, North Korea. South Korea said it will shut down the joint industrial park there and accused Pyongyang of using hard currency from Kaesong to develop its nuclear and missile programs. (Associated Press)