(AP PhotoMichel Euler, File) In this Dec. 6, 2015 file photo, environmentalist activists form a human chain representing the peace sign and the spelling out "100% renewable", on the side line of the COP21, United Nations Climate Change Conference near the Eiffel Tower in Paris. Four months after negotiating a global climate agreement in Paris, government officials are coming to New York on Friday, April 22, 2016, to sign the pact in a ceremony at the United Nations.