Leo DiCaprio @ Live Earth

Leonardo DiCaprio lends his voice to the cause, drumming home the dangers of global warming and urged people to go green while onstage during Live Earth New York at Giants Stadium on Saturday in East Rutherford, New Jersey.

“We can’t afford to fail,” said Leo. “This moment is a tipping point in history.”

The Revolutionary Road actor then proceeded to introduce the man of the hour (well, 22 hours), environmentalist and former vice president Al Gore. Leo described Gore as a “global messenger of hope when we most need it.”