FILE- In this Sunday, Nov. 29, 2015 file photo, an artwork entitled 'One Heart One Tree' by artist Naziha Mestaoui is displayed on the Eiffel tower ahead of the 2015 Paris Climate Conference, in Paris. The Paris Agreement on climate change comes into force Friday Nov. 4, 2016, after a year with remarkable success in international efforts to slash man-made emissions of carbon dioxide and other global warming gases. (AP Photo/Thibault Camus, FILE)
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