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The 11th hour is considered the final moment when change is possible. Former Soviet leader Mikhail Gorbachev, theoretical physicist Stephen Hawking and former CIA director R. James Woolsey along with more than 50 other scientists, scholars, and leaders discuss pressing issues facing today's world. Specialists reveal how human actions impact the Earth's ecosystems, and what can be done to reverse or slow the damage before it is too late to save the planet. Narrated by Leonardo DiCaprio.