Environment

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Robert F. Kennedy Jr. is barnstorming states, talking to legislators and hosting screenings of the film "Trace Amounts," which ties a mercury-based preservative in some childhood vaccines to autism. (Associated Press)

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A marijuana plant grows in a hydroponics garden inside an apartment in Mexico City on Aug. 29, 2013. (Associated Press) **FILE**

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While Ebola is losing its grip on Sierra Leone, major losses of rice production in its wake will soon devastate the country and lead to massive famine without international aid. (associated press)

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Austin Dodge, of Southern Oregon University, runs drills during an NFL Regional Combine on Saturday, March 7, 2015, in Lake Forest, Ill. (AP Photo/Andrew A. Nelles)

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Takari Johnson, of Concordia University Ann Arbor, runs through drills during an NFL Regional Combine on Saturday, March 7, 2015, in Lake Forest, Ill. (AP Photo/Andrew A. Nelles)

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Austin Dodge, of Southern Oregon University, throws during an NFL Regional Combine on Saturday, March 7, 2015, in Lake Forest, Ill. (AP Photo/Andrew A. Nelles)

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Tyler Callaghan, of Saint Joseph's College, runs the 40-yard dash during an NFL regional combine on Saturday, March 7, 2015, in Lake Forest, Ill. (AP Photo/Andrew A. Nelles)

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Carroll Washington, of The University of Arkansas, rests between drills during an NFL Regional Combine on Saturday, March 7, 2015, in Lake Forest, Ill. (AP Photo/Andrew A. Nelles)

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Participants run a lap during an NFL Regional Combine on Saturday, March 7, 2015, in Lake Forest, Ill. (AP Photo/Andrew A. Nelles)

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Charles Hunter, of Texas Christian University, runs through drills during an NFL Regional Combine on Sunday, March 8, 2015, in Lake Forest, Ill. (AP Photo/Andrew A. Nelles)

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Brock DeCicco makes a catch during an NFL Regional Combine on Sunday, March 8, 2015, in Lake Forest, Ill. (AP Photo/Andrew A. Nelles)

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Wake Forest defensive back Kevin Johnson runs a drill at the NFL football scouting combine in Indianapolis, Monday, Feb. 23, 2015. (AP Photo/Julio Cortez)

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La'Velle Spivey, of Urbana University, runs through drills during an NFL Regional Combine on Saturday, March 7, 2015, in Lake Forest, Ill. (AP Photo/Andrew A. Nelles)

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Francisco Llanos, of Lindenwood University, runs through drills during an NFL Regional Combine on Saturday, March 7, 2015, in Lake Forest, Ill. (AP Photo/Andrew A. Nelles)

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Michael Heitz, of The University of Illinois, runs through drills during an NFL Regional Combine on Sunday, March 8, 2015, in Lake Forest, Ill. (AP Photo/Andrew A. Nelles)