The Movie Insider.com

"The 11th Hour" is the last moment when change is possible. The film explores how we've arrived at this moment-how we live, how we impact the earth's ecosystems, and what we can do to change our course. Featuring ongoing dialogues of experts from all over the world, including former Soviet Prime Minister Mikhail Gorbachev, renowned scientist Stephen Hawking, former head of the CIA R. James Woolsey and sustainable design experts William McDonough and Bruce Mau in addition to over 50 leading scientists, thinkers and leaders who discuss the most important issues that face our planet and people.

"Global warming is not only the No. 1 environmental challenge we face today, but one of the most important issues facing all of humanity," DiCaprio said. "We all have to do our part to raise awareness about global warming and the problems we as a people face in promoting a sustainable environmental future for our planet."