What could possibly bring together Kelly Clarkson, Ludacris, and Smashing Pumpkins? Why, Al Gore, of course. It seems everyone’s jumped on the green bandwagon for Live Earth, Gore’s latest celebrity-studded effort to raise awareness about global warming. The 24-hour musicfest, which was modeled after the super-successful Live 8 concert in 2005, will take place in cities on all seven continents, featuring more than 100 performers and reaching an audience of 2 billion people. Proceeds from ticket sales will be donated to The Alliance for Climate Protection and other international environmental organizations.

The festivities kick off on July 7 in Sydney and proceed through the times zones to Rio de Janeiro, Johannesburg, Tokyo and Shanghai. The North American show will be held at New Jersey’s Giants Stadium, and not since Cyndi Lauper, Tito Jackson and Bob Dylan all shared the stage to sing “We Are the World” in 1985 has such a diverse crew of pop stars been assembled: Dave Matthews Band, The Police, Rihanna, and many others are set to perform. Across the pond, the Beastie Boys, the Red Hot Chili Peppers, and Madonna will play in London’s Wembley Stadium. Didn’t get your ticket? No worries, the performances will be streaming live at liveearth.msn.com. At press time, organizers were still booking acts for the Antarctica show. Perhaps Sanjaya is free?