We've known for a while that Leonardo DiCaprio is a big greeny.
Of the environmental sort, that is...
But now the celeb eco-warrior is putting his money where his mouth his.
True to the cause, he has produced a film, The 11th Hour, all about the impact human life has on the earth's ecosystems, and what we can do to change what's currently happening.
It's a cause close to Leo's heart - he also co-wrote the script and he narrates the action.
Check out the celebs who rocked up to see how green our future could be...
Social bookmarking allows you to save and categorise a personal collection of bookmarks and share them with others. This is different to using your own browser bookmarks which are available within your web browser.
Use the links on the left to share this page on the social bookmarking site of your choice.
Read more about social bookmarking at: Wikipedia - Social Bookmarking