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Paris Saint Germain's Zlatan Ibrahimovici controls the ball, during his French League one soccer match against Valenciennes, at the Parc des Princes stadium, in Paris, Friday, Feb. 14, 2014. (AP Photo/Thibault Camus)
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Paris Saint Germain's Ezequiel Lavezzi, center, is seen on his knees during his French League one soccer match against Valenciennes, at the Parc des Princes stadium, in Paris, Friday, Feb. 14, 2014. (AP Photo/Thibault Camus)
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Paris Saint Germain's Zlatan Ibrahimovic reacts during his French League one soccer match against Valenciennes, at the Parc des Princes stadium, in Paris, Friday, Feb. 14, 2014. (AP Photo/Thibault Camus)
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In this Jan. 15, 2014 photo, Norberto Munive cuts down a large pine tree near Sheridan Lake, S.D. The survey conducted by the U.S. Forest Service, South Dakota's Agriculture Department and Wyoming's State Forestry Division measured trees that were infected by pine beetles that left trees in the fall of 2012 and spread to new timber last year. (AP Photo/Rapid City Journal, Chris Huber)
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David Ferrer of Spain returns the ball to Fabio Fognini of Italy during the final match of the Buenos Aires' Copa Claro Open in Buenos Aires, Argentina, Sunday, Feb. 16, 2014.Ferrer won 6-4, 6-3. (AP Photo/Victor R. Caivano)
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Fabio Fognini of Italy throws his racket during the final match of the Buenos Aires' Copa Claro Open against David Ferrer of Spain in Buenos Aires, Argentina, Sunday, Feb. 16, 2014. Ferrer won 6-4, 6-3. (AP Photo/Victor R. Caivano)
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David Ferrer of Spain eyes the ball during the final match of the Buenos Aires' Copa Claro Open against Fabio Fognini of Italy in Buenos Aires, Argentina, Sunday, Feb. 16, 2014. Ferrer won 6-4, 6-3. (AP Photo/Victor R. Caivano)
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David Ferrer of Spain, left, and Fabio Fognini of Italy, right, pose after the final match of the Buenos Aires' Copa Claro Open in Buenos Aires, Argentina, Sunday, Feb. 16, 2014. Ferrer won 6-4, 6-3. (AP Photo/Victor R. Caivano)
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This handout photo provided by The National Oceanic and Atmospheric Administration (NOAA) shows Arctic sea ice in 2013. The Arctic isn't nearly as bright and white as it used to be because of more ice melting in the ocean, and that's turning out to be a global problem, a new study says. With more dark, open water in the summer, less of the sun's heat is reflected back into space. So the entire Earth is absorbing more heat than expected, according to a study published Monday in the Proceedings of the National Academy of Sciences. (AP Photo/NOAA)
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FILE - In this Jan. 24, 2014, file photo, cars pass railroad crews working on one of six tank cars carrying oil from North Dakota that derailed near the heart of Philadelphia on a bridge above the Schuylkill River. Although no oil was spilled, the accident rattled nerves. Industry experts say trains carrying crude and other flammables are likely to continue rolling through major cities despite pressure to steer the potentially-explosive shipments around population centers. (AP Photo/Matt Rourke, File)
