Activists, celebrating US President Barack Obama's blocking of the Keystone XL oil pipeline, rally in front of the White House in Washington, DC on November 6, 2015. US President Barack Obama blocked the Keystone XL oil pipeline that Canada sought to build into the United States, ruling it would harm the fight against climate change. AFP PHOTO/MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
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AFP MANDEL NGAN