About 80 percent of Tumaco's people live on or alongside the water, where they are highly vulnerable to any changes in the climate or water levels. The flooding in recent years has caught many of the locals by surprise. Tom Gjelten/NPR hide caption

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A U.S. Army helicopter flies over the snow-capped Hindu Kush mountains of Afghanistan in this 2002 photo. U.S. security analysts are trying to develop a set of early warning signs that could suggest which countries are in most danger of being destabilized as a result of dramatic climate changes. Joe Raedle/Getty Images hide caption

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U.S. soldiers in Afghanistan's Wardak province prepare to board a Black Hawk helicopter. The Obama administration is assessing U.S. military strategy in Afghanistan and weighing whether to send tens of thousands more troops. Dima Gavrysh/AP hide caption

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Iran's elite Revolutionary Guards march during a military parade in Tehran in September 2008 to commemorate the 28th anniversary of Iran's 1980-1988 war with Iraq. The semi-independent group has taken quietly taken over dozens of companies in the country. Behrouz Mehri/AFP/Getty Images hide caption

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