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What Future Threats Look Like in a Climate Change World

<p>Calving Glacier Alaska</p>

In the 1979 film Mad Max, Mel Gibson played a police officer who navigated an apocalyptic world plagued by a scarcity of resources. Sixteen years later, in the movie Waterworld, Kevin Costner portrayed a man who had to find a way to survive after the polar ice cap had completely melted, and the sea level had risen to more than 25,000 feet.

Hollywood knows that audiences love a good survival story, but as climate change becomes a more mainstream real-world security issue, what are the people charged with U.S. national security doing about it?  Former national security experts say: not enough. 

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