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Former U.S. Vice President Al Gore, left, and U.S. singer Pharrell Williams, right, enjoy the view on the roof top of the Congress Center where the World Economic Forum takes place in Davos, Switzerland, Wednesday, Jan. 21, 2015. (AP Photo/Michel Euler) ** FILE **

Former U.S. Vice President Al Gore, left, and U.S. singer Pharrell Williams, right, enjoy the view on the roof top of the Congress Center where the World Economic Forum takes place in Davos, Switzerland, Wednesday, Jan. 21, 2015. (AP Photo/Michel Euler) ** FILE **

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