In September of 2014, the United Nations Secretary-General, Ban Ki-moon, appointed Leonardo DiCaprio UN Messenger of Peace. On the UN's website, Mr. Ban talked about this decision: “Mr. DiCaprio is a credible voice in the environmental movement, and has a considerable platform to amplify its message. I am pleased he has chosen to add his voice to UN efforts to raise awareness of the urgency and benefits of acting now to combat climate change.”

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This isn't the first case of DiCaprio taking an interest in climate change. In 1998, DiCaprio started the “Leonardo DiCaprio Foundation" which is working towards "protecting the Earth’s last wild places and implementing solutions to build a more harmonious relationship between humanity and the natural world." An article on the UN's website had this to say about the foundation and DiCaprio's work: "Since [1998] DiCaprio has worked on some of the most pressing environmental and humanitarian issues of our day. Through grant making, public campaigning and media projects, he has brought attention and needed funding to three focus areas — protecting biodiversity, ocean and forest conservation, and climate change." 

DiCaprio's website mentioned that as recent as October of 2014 his foundation donated 2 million dollars to Oceans 5, "an international funders’ collaborative," which will be used towards "stopping overfishing and establishing marine reserves in the world’s five oceans." This goes to show that his dedication to educating people about climate change, his actions towards making a change, and his foundation that he started over a decade ago are all still very important to him.

At the Climate Summit on September 23rd, DiCaprio gave this inspiring opening speech. Check it out in the video below.