LOS ANGELES -- Detailing a historic effort to engage billions of people across the globe, Kevin Wall, Al Gore, Pharrell Williams, Cameron Diaz and the MSN Network launched Save Our Selves (SOS) - The Campaign for a Climate in Crisis.

The announcement was made at the California Science Center. SOS is designed to trigger a global movement to combat climate crisis. It will reach people in every corner of the planet through television, film, radio, the Internet and Live Earth, a 24-hour concert on July 7 across all seven continents that will bring together more than 100 of the world's top musical acts.

Live Earth alone will engage an audience of more than 2 billion people through concert attendance and broadcasts. MSN has partnered with SOS to use its reach to make the Live Earth concerts available across the globe. The Live Earth audience, and the proceeds from the concerts, will create the foundation for a new, multi-year global effort to combat the climate crisis led by The Alliance for Climate Protection and its Chair, Al Gore. SOS was founded by Kevin Wall, who won an Emmy as Worldwide Executive Producer of Live 8.

Wall announced 25 of the 100 top musical acts that have answered SOS's call and are performing at Live Earth. SOS is also engaging other celebrities, CEOs, athletes, academics and government leaders to engage their constituencies. Please see below for that list of 25 artists.

"More than 100 artists are performing at Live Earth and they're all headliners. That's what it takes to engage billions of people. We're not just engaging fans of the Red Hot Chili Peppers and Snoop Dogg, or the Foo Fighters and Faith Hill. We're engaging them and everyone in between," Wall said. "We've been overwhelmed by the response from the artist community and are feverishly working out the logistics for all of the bands that want to be involved. Today we are announcing just the first 25 and will soon be announcing even more headliners who, for contractual reasons, cannot be announced today."

The campaign's identity is based on SOS, the international Morse code distress signal: three dots, followed by three dashes, followed by three dots. SOS is the most urgent, universal message we have, and SOS will use that signal as a continuous distress call to prompt individuals, corporations and governments around the world to respond to our climate crisis with action.

Wall announced that Live Earth concerts will take place in Brazil, Shanghai, Japan, Johannesburg, London, Sydney, and the Eastern United States.

Live Earth will be broadcast worldwide on MSN

Artists across all genres performing:

Pharrell Duran Duran
Red Hot Chili Peppers Snow Patrol
Foo Fighters John Legend
Snoop Dogg Black Eyed Peas
Lenny Kravitz Akon
Bon Jovi Enrique Iglesias
Paolo Nutini Fall Out Boy
Sheryl Crow Mana
AFI Keane
Melissa Etheridge Kelly Clarkson
John Mayer Korn
Damien Rice Faith Hill w/ Tim McGraw
Corrine Bailey Rae Bloc Party