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california_climate_change_83774.jpg

State Assembly member Eduardo Garcia gestures while speaking before a climate bill signing on Treasure Island Tuesday, July 25, 2017, in San Francisco. Gov. Jerry Brown signed legislation Tuesday keeping alive California's signature initiative to fight global warming, which puts a cap and a price on climate-changing emissions. The Democratic governor was joined by his celebrity predecessor, Arnold Schwarzenegger, who signed the 2006 bill that led to the creation of the nation's only cap and trade system to reduce greenhouse gases in all industries.(AP Photo/Eric Risberg)

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california_climate_change_27115.jpg

California Gov. Jerry Brown, left, walks to sign a climate bill and is followed by former Gov. Arnold Schwarzenegger, right, on Treasure Island, Tuesday, July 25, 2017, in San Francisco. Gov. Jerry Brown signed legislation Tuesday keeping alive California's signature initiative to fight global warming, which puts a cap and a price on climate-changing emissions. The Democratic governor was joined by his celebrity predecessor, Arnold Schwarzenegger, who signed the 2006 bill that led to the creation of the nation's only cap and trade system to reduce greenhouse gases in all industries. (AP Photo/Eric Risberg)

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california_climate_change_93236.jpg

California Gov. Jerry Brown signs a climate bill as former Gov. Arnold Schwarzenegger, fifth from left, watches on Treasure Island, Tuesday, July 25, 2017, in San Francisco. Gov. Jerry Brown signed legislation Tuesday keeping alive California's signature initiative to fight global warming, which puts a cap and a price on climate-changing emissions. The Democratic governor was joined by his celebrity predecessor, Arnold Schwarzenegger, who signed the 2006 bill that led to the creation of the nation's only cap and trade system to reduce greenhouse gases in all industries. (AP Photo/Eric Risberg)

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california_climate_change_72795.jpg

Former California Gov. Arnold Schwarzenegger gestures while speaking as Gov. Jerry Brown, left, listens before a climate bill signing on Treasure Island, Tuesday, July 25, 2017, in San Francisco. Gov. Jerry Brown signed legislation Tuesday keeping alive California's signature initiative to fight global warming, which puts a cap and a price on climate-changing emissions. The Democratic governor was joined by his celebrity predecessor, Arnold Schwarzenegger, who signed the 2006 bill that led to the creation of the nation's only cap and trade system to reduce greenhouse gases in all industries.(AP Photo/Eric Risberg)

california_climate_change_07768.jpg

california_climate_change_07768.jpg

California Gov. Jerry Brown holds up a climate bill after signing it as former Gov. Arnold Schwarzenegger, third from left, looks on at Treasure Island Tuesday, July 25, 2017, in San Francisco. Gov. Jerry Brown signed legislation Tuesday keeping alive California's signature initiative to fight global warming, which puts a cap and a price on climate-changing emissions. The Democratic governor was joined by his celebrity predecessor, Arnold Schwarzenegger, who signed the 2006 bill that led to the creation of the nation's only cap and trade system to reduce greenhouse gases in all industries.(AP Photo/Eric Risberg)

california_climate_change_35022.jpg

california_climate_change_35022.jpg

California Gov. Jerry Brown, right, and former Gov. Arnold Schwarzenegger, left, talk before a climate bill signing on Treasure Island, Tuesday, July 25, 2017, in San Francisco. Gov. Jerry Brown signed legislation Tuesday keeping alive California's signature initiative to fight global warming, which puts a cap and a price on climate-changing emissions. The Democratic governor was joined by his celebrity predecessor, Arnold Schwarzenegger, who signed the 2006 bill that led to the creation of the nation's only cap and trade system to reduce greenhouse gases in all industries. (AP Photo/Eric Risberg)

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7_252017_natural-bridge-tests8201.jpg

Virginia officials plan to use ground-penetrating radar to test the long-term stability of Natural Bridge, the landmark limestone arch that supports part of U.S. Route 11. Authorities are concerned about its continuing ability to support some 2,000 vehicles per day. (Associated Press)

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film_review__an_inconvenient_sequel_90023.jpg

This image released by Paramount Pictures shows Al Gore in "An Inconvenient Sequel: Truth to Power." (Jensen Walker/Paramount Pictures via AP)

pronghorn_population_46601.jpg

pronghorn_population_46601.jpg

FILE - In this undated file photo, pronghorns run through a field near Bismarck, N.D. North Dakota's pronghorn population and the popular hunting opportunity it provides both have taken a blow this year, with both wet and dry weather cited as reasons. Pronghorn numbers are down 14 percent from 2016, and the number of licenses being offered for the fall hunt is down 44 percent. The state's wildlife chief acknowledges it's a big setback. (Brian Gehring/The Bismarck Tribune via AP, File)

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american_killed_syria_96118.jpg

In this undated photo provided by David Taylor Sr., former Marine David Taylor poses for an official portrait while in the Marine Corps. David Taylor Sr. told The Associated Press on Tuesday, July 25, 2017, that he was notified by the U.S. State Department that his son was killed earlier this month in Syria while fighting for a Kurdish militia battling the Islamic State group. (U.S. Marine Corps/David Taylor Sr. AP)

film_review__an_inconvenient_sequel_96155.jpg

film_review__an_inconvenient_sequel_96155.jpg

This image released by Paramount Pictures shows Al Gore in "An Inconvenient Sequel: Truth to Power." (Jensen Walker/Paramount Pictures via AP)

film_review__an_inconvenient_sequel_84583.jpg

film_review__an_inconvenient_sequel_84583.jpg

This image released by Paramount Pictures shows Al Gore in "An Inconvenient Sequel: Truth to Power." (Jensen Walker/Paramount Pictures via AP)

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new_arctic_icescapes_gallery_54613.jpg

Broken sea ice emerges from under the hull of the Finnish icebreaker MSV Nordica as it sails through the Victoria Strait while traversing the Arctic's Northwest Passage, Friday, July 21, 2017. Sea ice forms when the top layer of water reaches freezing point, usually around the start of October. As temperatures continue to fall this first-year ice grows downward until it is several feet thick. If the ice survives the following summer melt it becomes second-year ice. Another cycle and it becomes multi-year ice, which is the toughest kind. (AP Photo/David Goldman)

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new_arctic_icescapes_gallery_82414.jpg

Broken sea ice emerges from under the hull of the Finnish icebreaker MSV Nordica as it sails through the Franklin Strait while traversing the Arctic's Northwest Passage, Saturday, July 22, 2017. Sea ice forms when the top layer of water reaches freezing point, usually around the start of October. As temperatures continue to fall this first-year ice grows downward until it is several feet thick. If the ice survives the following summer melt it becomes second-year ice. Another cycle and it becomes multi-year ice, which is the toughest kind. (AP Photo/David Goldman)

new_arctic_icescapes_gallery_55236.jpg

new_arctic_icescapes_gallery_55236.jpg

Broken sea ice emerges from under the hull of the Finnish icebreaker MSV Nordica as it sails through the Victoria Strait while traversing the Arctic's Northwest Passage, Friday, July 21, 2017. (AP Photo/David Goldman)

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new_arctic_icescapes_gallery_12715.jpg

Water sprays as a block of sea ice is broken from the hull of the Finnish icebreaker MSV Nordica as it sails the Victoria Strait while traversing the Arctic's Northwest Passage, Friday, July 21, 2017. (AP Photo/David Goldman)

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new_arctic_icescapes_gallery_96374.jpg

A block of sea ice floats in the Franklin Strait in the wake of the Finnish icebreaker MSV Nordica as it sails the Arctic's Northwest Passage, Saturday, July 22, 2017. Sea ice forms when the top layer of water reaches freezing point, usually around the start of October. As temperatures continue to fall this first-year ice grows downward until it is several feet thick. If the ice survives the following summer melt it becomes second-year ice. Another cycle and it becomes multi-year ice, which is the toughest kind. (AP Photo/David Goldman)

new_arctic_icescapes_gallery_54771.jpg

new_arctic_icescapes_gallery_54771.jpg

Broken sea ice emerges from under the hull of the Finnish icebreaker MSV Nordica as it sails through the Franklin Strait while traversing the Arctic's Northwest Passage, Saturday, July 22, 2017. (AP Photo/David Goldman)

new_arctic_icescapes_gallery_49531.jpg

new_arctic_icescapes_gallery_49531.jpg

A block of sea ice floats in the wake of the Finnish icebreaker MSV Nordica as it sails through the Victoria Strait while traversing the Arctic's Northwest Passage, Friday, July 21, 2017. Sea ice forms when the top layer of water reaches freezing point, usually around the start of October. As temperatures continue to fall this first-year ice grows downward until it is several feet thick. If the ice survives the following summer melt it becomes second-year ice. Another cycle and it becomes multi-year ice, which is the toughest kind. (AP Photo/David Goldman)

new_arctic_icescapes_gallery_26944.jpg

new_arctic_icescapes_gallery_26944.jpg

Broken sea ice emerges from under the hull of the Finnish icebreaker MSV Nordica as it sails through the Victoria Strait while traversing the Arctic's Northwest Passage, Friday, July 21, 2017. As a general rule, the older ice gets the more it turns blue and acquires mounds, so-called hummocks, on top from years of crashing into other floes. (AP Photo/David Goldman)