In this Sunday, Dec. 6, 2015, photo, the Eiffel Tower lights up with the slogan”Action Now”referring to the COP21, United Nations Climate Change Conference in Paris. The carbon footprint for the COP21 conference runs to thousands of tons, for the some 40,000 people, including heads of state, negotiators, activists and journalists, in Paris to hash out a ground-breaking international agreement to put a brake on global warming. (AP Photo/Michel Euler)