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In
this Dec. 12, 2015 photo, French President Francois Hollande, right, French
Foreign Minister and president of the COP21 Laurent Fabius, second, right,
United Nations climate chief Christiana Figueres and United Nations Secretary
General Ban ki-Moon applaud after the final conference at the COP21, the United
Nations conference on climate change, in Le Bourget, north of Paris. (AP Photo/Francois Mori)
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More than 170 countries
are lining up to sign the Paris Agreement on climate change Friday as the
landmark deal takes a key step toward entering into force years ahead of
schedule.