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

United States Secretary of State John Kerry holds granddaughter Isabelle Dobbs Higginson while he signs the Paris Agreement on Climate Change at the headquarters of the United Nations in New York City on April 22, 2016. A historic meeting takes place today as 155 countries have committed to sign the Paris Agreement on Climate Change. Photo by John Angelillo/UPI | License Photo

United Nations Secretary-General Ban Ki-moon meets UN Messenger of Peace (with a special focus on climate change) Leonardo DiCaprio at the United Nations in New York on April 22, 2016. DiCaprio was one of many high profile guests and world leaders attending the signing ceremony for the Paris Agreement on Climate Change. UN Photo by Eskinder Debebe/UPI | License Photo

U.S. Secretary of State John Kerry sits backstage with Canadian Prime Minister Justin Trudeau and Italian Prime Minister Matteo Renzi before all three 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

United Nations Secretary-General Ban Ki-moon uses a Twitter Mirror to tweet out a message of celebration for today's signing ceremony. More than 165 member states were expected to attend the signing ceremony, including an estimated 60 Heads of States and Heads of Governments on April 22, 2016. This would set a record for countries signing an international agreement on a single day. UN Photo by Eskinder Debebe/UPI | License Photo

President Republic of France Mr. Francois Hollande signs the Paris Agreement on Climate Change at the headquarters of the United Nations in New York City on April 22, 2016. A historic meeting takes place today as 155 countries have committed to sign the Paris Agreement on Climate Change. Photo by John Angelillo/UPI | License Photo

Leonardo DiCaprio applauds a speaker at the Paris Agreement on Climate Change meeting at the headquarters of the United Nations in New York City on April 22, 2016. A historic meeting takes place today as 155 countries have committed to sign the Paris Agreement on Climate Change. Photo by John Angelillo/UPI | License Photo

United States Secretary of State John Kerry kisses his granddaughter Isabelle Dobbs Higginson after he signs the Paris Agreement on Climate Change at the headquarters of the United Nations in New York City on April 22, 2016. A historic meeting takes place today as 155 countries have committed to sign the Paris Agreement on Climate Change. Photo by John Angelillo/UPI | License Photo

United Nations Secretary-General Ban Ki-moon (top, second from left) meets with Dilma Rousseff (top left), President of Brazil at the United Nations in New York on April 22, 2016. Rousseff was one of many high profile guests and world leaders attending the signing ceremony for the Paris Agreement on Climate Change. UN Photo by Mark Garten/UPI | License Photo

Prime Minister of Canada Justin Trudeau speaks at the Paris Agreement on Climate Change meeting at the headquarters of the United Nations in New York City on April 22, 2016. A historic meeting takes place today as 155 countries have committed to sign the Paris Agreement on Climate Change. Photo by John Angelillo/UPI | License Photo

Leonardo DiCaprio stands with Ms. Getrude Clement and Ms. Hindou Oumarou Ibrahim after speaking at the Paris Agreement on Climate Change meeting at the headquarters of the United Nations in New York City on April 22, 2016. A historic meeting takes place today as 155 countries have committed to sign the Paris Agreement on Climate Change. Photo by John Angelillo/UPI | License Photo

U.S. Secretary of State John Kerry sits backstage with his 2-year-old granddaughter, Isabelle Dobbs-Higginson, before he addressed delegates and 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

Prime Minister of Canada Justin Trudeau signs the Paris Agreement on Climate Change at the headquarters of the United Nations in New York City on April 22, 2016. A historic meeting takes place today as 155 countries have committed to sign the Paris Agreement on Climate Change. Photo by John Angelillo/UPI | License Photo

Leonardo DiCaprio speaks at the Paris Agreement on Climate Change meeting at the headquarters of the United Nations in New York City on April 22, 2016. A historic meeting takes place today as 155 countries have committed to sign the Paris Agreement on Climate Change. Photo by John Angelillo/UPI | License Photo

There is a standing ovation before they begin the signing of the Paris Agreement on Climate Change at the headquarters of the United Nations in New York City on April 22, 2016. A historic meeting takes place today as 155 countries have committed to sign the Paris Agreement on Climate Change. Photo by John Angelillo/UPI | License Photo

President of Zimbabwe Robert Mugabe signs the Paris Agreement on Climate Change at the headquarters of the United Nations in New York City on April 22, 2016. A historic meeting takes place today as 155 countries have committed to sign the Paris Agreement on Climate Change. Photo by John Angelillo/UPI | License Photo

President Federative Republic of Brazil Dilma Rousseff signs the Paris Agreement on Climate Change at the headquarters of the United Nations in New York City on April 22, 2016. A historic meeting takes place today as 155 countries have committed to sign the Paris Agreement on Climate Change. Photo by John Angelillo/UPI | License Photo

United Nations Secretary-General Ban Ki-moon meets with the three speakers who addressed the opening segment of the Paris Agreement on Climate Change signing ceremony: Hindou Oumarou Ibrahim (from Chad), civil society representative; UN Messenger of Peace (with a special focus on climate change) Leonardo DiCaprio; and Gertrude Clement, 16-year-old radio reporter from Tanzania and youth representative and climate advocate with the UN Children's Fund (UNICEF) at the United Nations in New York on April 22, 2016. These individuals were just a handful of the many high profile guests and world leaders attending the signing ceremony for the Paris Agreement on Climate Change. UN Photo by Mark Garten/UPI | License Photo

President Republic of France Mr. Francois Hollande speaks at the Paris Agreement on Climate Change meeting at the headquarters of the United Nations in New York City on April 22, 2016. A historic meeting takes place today as 155 countries have committed to sign the Paris Agreement on Climate Change. Photo by John Angelillo/UPI | License Photo

President Federative Republic of Brazil Dilma Rousseff speaks at the Paris Agreement on Climate Change meeting at the headquarters of the United Nations in New York City on April 22, 2016. A historic meeting takes place today as 155 countries have committed to sign the Paris Agreement on Climate Change. Photo by John Angelillo/UPI | License Photo

President of the State of Palestine Mahmoud Abbas signs the Paris Agreement on Climate Change at the headquarters of the United Nations in New York City on April 22, 2016. A historic meeting takes place today as 155 countries have committed to sign the Paris Agreement on Climate Change. Photo by John Angelillo/UPI | License Photo

U.S. Secretary of State John Kerry plays backstage with his 2-year-old granddaughter, Isabelle Dobbs-Higginson, before he addressed delegates and 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

U.S. Secretary of State John Kerry looks over his speech text during the opening of the United Nations Signing Event for 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

United Nations Secretary-General Ban Ki-moon prepares for his speech prior to addressing the opening ceremony for the signing of the Paris Agreement on Climate Change at the United Nations in New York on April 22, 2016. More than 165 member states were expected to attend the signing ceremony, including an estimated 60 Heads of States and Heads of Governments. This would set a record for countries signing an international agreement on a single day. UN Photo by Eskinder Debebe/UPI | License Photo

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