Leonardo DiCaprio and US Secretary of State John Kerry
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Leonardo DiCaprio's role as eco warrior

19 June 2014 Last updated at 11:19 BST

Leonardo DiCaprio has said he is going to give a seven million dollar donation to help clean up the world's oceans.

The Hollywood actor and environmentalist made the pledge as he addressed the US State Department's Our Ocean conference.

It coincided with President Barack Obama's announcement of new efforts to protect parts of the Pacific Ocean which are controlled by America.