Environment

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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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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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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)

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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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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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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)

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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)

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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)

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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)

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The bow of the Finnish icebreaker MSV Nordica pushes down sea ice as it sails through the Victoria Strait while traversing the Arctic's Northwest Passage, Friday, July 21, 2017. The MSV Nordica is equipped with several heavy-duty engines and a hardened bow and hull that allow it either to drive through thin layers of ice or to crush thicker sheets by rising onto the ice with the help of its rounded hull. The ship's massive weight breaks the ice from above. (AP Photo/David Goldman)

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The bow of the Finnish icebreaker MSV Nordica drives through sea ice as it sails the Victoria Strait while traversing the Arctic's Northwest Passage, Friday, July 21, 2017. The MSV Nordica is equipped with several heavy-duty engines and a hardened bow and hull that allow it either to drive through thin layers of ice or to crush thicker sheets by rising onto the ice with the help of its rounded hull. The ship's massive weight breaks the ice from above. (AP Photo/David Goldman)

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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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Broken blocks of sea ice emerge 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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A block of sea ice floats in the Victoria Strait in the wake of the Finnish icebreaker MSV Nordica as it sails 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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Nurses walk wearing masks to protect themselves form the swine flu virus outside the Naypyitaw Hospital Tuesday, July 25, 2017, in Naypyitaw, Myanmar. Public health officials in Myanmar say that H1N1 flu, also known as swine flu, has killed three people out of 13 confirmed cases of the infection. (AP Photo/Aung Shine Oo)

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Women wear masks to protect themselves against the swine flue virus, Tuesday, July.25, 2017, in Yangon, Myanmar. Public health officials in Myanmar say that H1N1 flu, also known as swine flu, has killed three people out of 13 confirmed cases of the infection. (AP Photo/Thein Zaw)

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Nurses cover their faces with masks to protect from the spread of the swine flu outside the Naypyitaw hospital, Tuesday, July 25, 2017, in Naypyitaw, Myanmar. Public health officials in Myanmar say that H1N1 flu, also known as swine flu, has killed three people out of 13 confirmed cases of the infection. (AP Photo/Aung Shine Oo)

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CORRECTS CREDIT TO PAUL W. GILLESPIE FROM PHIL DAVIS - Traffic is backed up on Route 8, a result of storm damage on Kent Island Monday, July 24, 2017, in Kent Island, Md. A National Weather Service team is headed to Maryland’s Eastern Shore Monday to determine whether a tornado touched down there amid severe storms. (Paul W. Gillespie/The Baltimore Sun via AP)

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CORRECTS CREDIT TO PAUL W. GILLESPIE FROM PHIL DAVIS - A tree is down on the side of Route 8 south Monday, July 24, 2017, in Kent Island, Md. A National Weather Service team is headed to Maryland’s Eastern Shore Monday to determine whether a tornado touched down there amid severe storms. (Paul W. Gillespie/The Baltimore Sun via AP)

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This frame from video by WUSA-TV shows homes Monday, July 24, 2017, destroyed by severe weather in Queen Anne's County, Md. Officials on Maryland's Eastern Shore are asking residents to shelter in place after severe weather overnight caused extensive damage and knocked out power to thousands. (WUSA-TV via AP)