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A demonstrator holds a banner reading 'One climate one world' during a rally held by several Non Governmental Organisations (NGO) to form a human chain on the Champs de Mars near the Eiffel Tower in Paris on December 12, 2015 on the sidelines of the COP21, the UN conference on global warming. French hosts submit the final version of a global climate-saving pact to negotiators at UN Conference on december 12. The goal is for ministers to approve the agreement by the end of the day but that could be extended one more day. / AFP / FRANCOIS GUILLOT (Photo credit should read FRANCOIS GUILLOT/AFP/Getty Images)

A demonstrator holds a banner reading 'One climate one world' during a rally held by several Non Governmental Organisations (NGO)  to form a human chain on the Champs de Mars near the Eiffel Tower in Paris on December 12, 2015 on the sidelines of the COP21, the UN conference on global warming.
French hosts submit the final version of a global climate-saving pact to negotiators at UN Conference on december 12. The goal is for ministers to approve the agreement by the end of the day but that could be extended one more day. / AFP / FRANCOIS GUILLOT        (Photo credit should read FRANCOIS GUILLOT/AFP/Getty Images)