President Obama and French President Francois Hollande place flowers at the Bataclan, site of one of the Paris terrorists attacks. Obama is in Paris for a climate-change conference. Evan Vucci/AP hide caption

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A power-generating windmill turbine is seen in front of the Arc de Triomphe on the Champs Elysees avenue in Paris ahead of the COP21 World Climate Summit, which begins Monday. Christian Hartmann/Reuters /Landov hide caption

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Delegates from about 170 countries gathered in Kyoto in December 1997 during the United Nations Framework Convention on Climate Change. This year in Paris, the stakes are even higher, negotiators say. AFP/Getty Images hide caption

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A demonstrator kicks a tear gas canister during clashes with riot police near the Place de la République after the cancellation of a planned climate march. Eric Gaillard /Reuters /Landov hide caption

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French President Francois Hollande delivers a speech honoring victims of the Paris attacks during a ceremony at the Invalides in Paris on Friday. The names of each of the 130 people killed in the attacks two weeks ago was read aloud. Francois Mori/AP hide caption

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Joel Touitou Laloux's family owned Paris' Bataclan theater from 1976 until last year, when the performance hall was sold and he retired to Israel. He's shown here on Nov. 18 at his home in the Mediterranean coastal city of Ashdod in southern Israel. Jack Guez/AFP/Getty Images hide caption

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Paris Prosecutor Francois Molins delivers a press conference Tuesday about the Nov. 13 attacks that claimed 130 lives in the French capital. Loic Venance/AFP/Getty Images hide caption

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French gendarmes patrol outside the Printemps department store in Paris, a city that's still on edge and on a security alert after last week's deadly terrorist attack. Joel Saget/AFP/Getty Images hide caption

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French chef Auguste Escoffier, seen here at a cafe in 1921, helped to found the Ritz Hotel, where Ernest Hemingway was a longtime regular. Hulton Archive/Getty Images hide caption

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