WAS01. Washington (United States), 29/11/2015.- US President Barack Obama walks across the South Lawn before departing the White House on board Marine One in Washington, DC., USA, 29 November 2015. Nearly 150 world leaders including President Obama are expected to descend on Paris for the start of the United Nations climate change summit, which begins in the French capital, 30 November 2015. (Estados Unidos) EFE/EPA/OLIVIER DOULIERY / POOL

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