by Carole LANDRY UNITED NATION, United States (AFP) — World leaders gather at the United Nations on Friday to sign the Paris climate deal and get the ball rolling on a quick entry into force to start beating back global warming. French President Francois Hollande and Canada’s Justin Trudeau will join US Secretary of State John Kerry for the ceremony attended by more than 165 governments, the largest ever one-day signing of an international agreement. […]