Environment

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Democratic presidential candidate Hillary Clinton crosses the stage to greet members of the audience at a town hall at the Haverford Community Recreation and Environmental Center in Haverford, Pa., Tuesday, Oct. 4, 2016. (AP Photo/Andrew Harnik)

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Democratic presidential candidate Hillary Clinton smiles while on stage at a town hall at the Haverford Community Recreation and Environmental Center in Haverford, Pa., Tuesday, Oct. 4, 2016. (AP Photo/Andrew Harnik)

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In this still image taken from video footage provided by the Daret Izza Media Office, an anti-government activist group, which has been authenticated based on its contents and other AP reporting, a big blast is seen at the edge of the city accompanied by a large plume of smoke and debris rising from the skyline, Daret Izza, Syria, Tuesday, Oct. 4, 2016. Activists say the explosion was caused by a thermobaric rocket launched by forces loyal to the Syrian government. (Daret Izza Media Office via AP)

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Democratic presidential candidate Hillary Clinton speaks at a town hall at the Haverford Community Recreation and Environmental Center in Haverford, Pa., Tuesday, Oct. 4, 2016. (AP Photo/Andrew Harnik)

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The GOES East satellite image provided by the National Oceanic and Atmospheric Administration (NOAA) and taken Monday, Oct. 3, 2016, at 9:15 a.m. EDT, shows Hurricane Matthew about 220 miles southeast of Kingston, Jamaica. Hurricane Matthew roared across the southwestern tip of Haiti with 145 mph winds Tuesday, Oct. 4, 2016, uprooting trees and tearing roofs from homes in a largely rural corner of the impoverished country as the storm headed north toward Cuba and the east coast of Florida. (NOAA via AP)

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UN Secretary General Ban Ki-moon gestures before addressing members of the European Parliament in Strasbourg, eastern France, Tuesday, Oct. 4, 2016. U.N. Secretary-General Ban Ki-moon spoke to the European Parliament ahead of a historic vote on the Paris climate accord. Final support from Europe will give the pact sufficient global support for it to enter into force around the world. (AP Photo/Jean-Francois Badias)

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Hollywood actor and activist Leonardo DiCaprio appears with President Obama in the trailer for his upcoming climate change documentary "Before the Flood." (YouTube, National Geographic)

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In this 2009 photo provided by NOAA and the Hawaii Undersea Research Laboratory, fish swim in a mesophotic coral ecosystem about 230 feet deep in the in Au'au Channel off Maui, Hawaii. Coral reefs in Hawaii’s oceanic twilight zone, the deep area of ocean where light still penetrates and photosynthesis occurs, are abundant and home to a wide variety of regionally unique fish species. A paper published Tuesday, Oct. 4, 2016 said that some of the reefs off the archipelago are the most extensive deep-water reef ecosystem ever recorded. (NOAA and Hawaii Undersea Research Laboratory via AP)

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A girl watches as authorities arrive to evacuate people from her house in Tabarre, Haiti, Monday, Oct. 3, 2016. The center of Hurricane Matthew is expected to pass near or over southwestern Haiti on Tuesday, but the area is already experiencing rain from the outer bands of the storm. (AP Photo/Dieu Nalio Chery)

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The head of Iran's space agency, Mohsen Bahrami, speaks during a news conference at his office, in Tehran, Iran, Tuesday, Oct. 4, 2016. Speaking to reporters at the start of World Space Week, Bahrami said his country is interested in cooperating with NASA. Iran has long harbored ambitions to launch satellites to monitor natural disasters in the earthquake-prone nation. The U.S. and its allies are concerned the same technology could be used to develop long-range missiles. (AP Photo/Vahid Salemi)

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UN Secretary General Ban Ki-moon waves before addressing members of the European Parliament in Strasbourg, eastern France, Tuesday, Oct. 4, 2016. U.N. Secretary-General Ban Ki-moon spoke to the European Parliament ahead of a historic vote on the Paris climate accord. Final support from Europe will give the pact sufficient global support for it to enter into force around the world. (AP Photo/Jean-Francois Badias)

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People stand on the coast watching the surf produced by Hurricane Matthew, on the outskirts of Kingston, Jamaica, Monday, Oct. 3, 2016. A hurricane warning is in effect for Jamaica, Haiti, and the Cuban provinces of Guantanamo, Santiago de Cuba, Holguin, Granma and Las Tunas - as well as the southeastern Bahamas. (AP Photo/Eduardo Verdugo)

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In this photo taken Saturday, Oct. 1, 2016, a recruit displays a camouflage technique at the Southern African Wildlife College on the edge of Kruger National Park in South Africa, where young men and women are trained to become field rangers and guides. As teams of poachers stalk rhinos and elephants in the park, wildlife officials are turning to nearby communities to help stop the slaughter by using local knowledge to deter poachers, not join them. (AP Photo/Denis Farrell)

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In this photo taken Saturday, Oct. 1, 2016, recruits at the Southern African Wildlife College on the edge of Kruger National Park in South Africa explain conditions in the wild during their attempts to track poachers. As teams of poachers stalk rhinos and elephants in the park, wildlife officials are turning to nearby communities to help stop the slaughter by using local knowledge to deter poachers, not join them. (AP Photo/Denis Farrell)

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President Barack Obama talks with actor Leonardo DiCaprio and Dr. Katharine Hayhoe about climate change as part of the White House South by South Lawn event on the South Lawn of the White House in Washington,Monday, Oct. 3, 2016. (AP Photo/Carolyn Kaster)

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Indiana Gov. Mike Pence "is the most conservative vice presidential nominee" in 50 years, according to the American Conservative Union. (Associated Press)

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In this February 2013 file photo, a Key deer forages for food in the National Key Deer Refuge in the Florida Keys. (AP Photo/Beth J. Harpaz, File) **FILE**

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Farmer Tom Marston, of Pittsfield, N.H., listens during the Milk Producers Emergency Relief Fund Board meeting, Monday, Oct. 3, 2016, in Concord, N.H. The board is trying to see what can be done quickly as farmers struggle with low milk prices and drought conditions. Nineteen of the state's 120 dairies have closed in recent months. (AP Photo/Jim Cole)

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FILE--This undated file photo provided by the U.S. Geological Survey shows a side view of a recently emerged adult female western glacier stonefly from below Grinnell Glacier in Glacier National Park, Mont. The U.S. Fish and Wildlife Service on Monday, Oct. 3, 2016, proposed adding the western glacier stonefly and the meltwater lednian stonefly to the government's list of threatened species.(Joe Giersch/U.S. Geological Survey via AP, File)