Canadian Prime Minister Justin Trudeau laughs as he speaks with Mexican President Enrique Pena Nieto during a session on carbon pricing at the United Nations climate change summit, Monday November 30, 2015 in Le Bourget, France. A plan on how Canada will meet a promise to lift visas for Mexicans will be announced later this month when Prime Minister Justin Trudeau hosts Mexico's president as part of the Three Amigos summit.