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Record Number Of Nations Sign Historic Paris Agreement On Climate Change

"You are the last, best hope of Earth," Leonardo DiCaprio told world leaders on Friday.

Posted on April 22, 2016, at 1:04 p.m. ET

More than 160 counties gathered at the United Nations on Friday to sign the historic Paris agreement on climate change, with the main goal of keeping a global temperature rise well below 2 degrees Celsius this century.

Mary Altaffer / AP

A record number of countries — a total of 175 — signed the agreement that was convened at the COP21 climate summit in Paris in December.

A total of 175 nations signed #ParisAgreement today. No doubt on the political will. Now vision needs to be made reality.

It's official! The #ParisAgreement is now open for signatures.

The agreement was hailed by the UN as a landmark given that it set a single-day record for number of nations signing on.

The number of signatories surpassed the previous record of 119 signatures for an opening day signing of an international agreement set in 1982 by the Law of the Sea in Montego Bay, according to the UN.

The main aim of the agreement is to keep the global temperature rise below 2 degrees Celsius and to limit the temperature increase even further to 1.5 degrees Celsius above pre-industrial levels.

"The 1.5-degree Celsius limit is a significantly safer defense line against the worst impacts of a changing climate," the UN stated.

"We are in a race against time," UN Secretary General Ban Ki-moon said at the signing ceremony. "I urge all countries to move quickly to join the Paris Agreement."

.@UN chief Ban: "Today at least 171 countries are gathered here in NY to sign the #ParisAgreement. 15 will ratify"

U.S. Secretary of State, John Kerry, signed the agreement — which he called "the strongest, most ambitious climate pact ever negotiated" — with his granddaughter in his arms.

Accompanied by his granddaughter, Secretary @JohnKerry signs #ParisAgreement at @UN this morning #EarthDay

"Climate change will test our intelligence, our compassion, and our will," Canadian Prime Minister Justin Trudeau said in his address. "But we are equal to that challenge."

Canada has officially signed the Paris Agreement on #ClimateChange!

"You are the last, best hope of Earth," Oscar winner and UN messenger of peace, Leonardo DiCaprio, said at the signing ceremony. "We ask you to protect it, or we, and all living things we cherish, are history."

"Our planet cannot be saved unless we leave fossil fuels in the ground" said @LeoDiCaprio at #ParisAgreement signing

A BuzzFeed News investigation, in partnership with the International Consortium of Investigative Journalists, based on thousands of documents the government didn't want you to see.