United Nations Secretary-General Ban Ki-moon announced Tuesday that actor Leonardo DiCaprio has been appointed as the newest UN Messenger for Peace. 

As such, he will advocate climate change issues on behalf of the organization.  

Next week, the UN hosts an international summit on climate change.

DiCaprio, 39, most recently starred in "The Wolf of Wall Street." 

The owner of several hybrid and electric vehicles, DiCaprio once called global warming "the number-one environmental challenge."

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The UN's Messenger for Peace moniker is meant to "distinguished individuals, carefully selected from the fields of art, music, literature and sports, who have agreed to help focus worldwide attention on the work of the United Nations." Past title holders include George Clooney and Edward Norton.