UN signing ceremony for Paris Agreement on Climate Change(25 images)

Some 170 world leaders gathered in New York on Earth Day to sign the Paris Agreement on Climate Change, also known as COP 21.

Canadian Prime Minister Justin Trudeau plays with the two-year-old granddaughter of U.S. Secretary of State John Kerry, Isabelle Dobbs-Higginson, before both officials signed the COP21 Climate Change Agreement on Earth Day, April 22, 2016, at the United Nations General Assembly Hall in New York. Photo by U.S. Department of State/UPI | License Photo
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