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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A shale gas well bore is lined by steel pipe, shown here in 100-foot sections in Washington County, Pa., at the drill site of Range Resources. Between its vertical and horizontal sections, a well bore will extend 9,000 feet or longer and require more than a million pounds of steel. Tom Gjelten/NPR hide caption

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Will the U.S. and other governments dare tell their citizens that to avoid another global crisis, they will have to take bitter medicine? Karen Bleier/AFP/Getty Images hide caption

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