The initial lineups have been announced for the US and UK segments of the massive, 24-hour Live Earth [ tickets ] concerts, which will take place July 7 on all seven continents in an effort to bring attention to global warming.

The concerts will conclude at New Jersey's Giants Stadium with performances by The Police [ tickets ], Roger Waters [ tickets ], Smashing Pumpkins [ tickets ], Kanye West [ tickets ], John Mayer, AFI, Kelly Clarkson, Akon, KT Tunstall, Alicia Keys, Ludacris, Bon Jovi, Melissa Etheridge, Dave Matthews Band, Rihanna and Fall Out Boy. Tickets for the US concert go on sale April 16.

"Capping Live Earth with a blockbuster show like this will ensure we meet our challenge of building a mass audience to combat global warming," Live Earth founder and executive producer Kevin Wall said in a statement. "Live Earth will be a monumental event both in terms of entertainment and in turning the tide against global warming."

Acts announced so far for the UK version of the event at London's Wembly Stadium are Beastie Boys, Black Eyed Peas, Bloc Party, Corinne Bailey Rae, Damien Rice, David Gray, Duran Duran, Foo Fighters, Genesis, James Blunt, John Legend, Keane, Madonna, Paolo Nutini, Razorlight, Red Hot Chili Peppers and Snow Patrol.

A ballot system will be used for UK tickets, and registration begins April 13. Details are available at the Live Earth website.

The global concert will begin at Sydney, Australia's Aussie Stadium and will also take over Rio de Janeiro, Brazil's Copacabana Beach; Johannesburg, South Africa's Cradle of Human Kind; Tokyo, Japan's Tokyo Dome; and a location to be announced in Shanghai, China. More than 100 artists are expected to perform.

The shows will stream live at the Live Earth website, and portions will be broadcast on NBC-TV in the US and on more than 120 television networks around the world, according to a press release. Organizers expect an audience of more than 2 billion.

"By attracting an audience of billions, we hope Live Earth will launch a global campaign giving a critical mass of people around the world the tools they need to help solve the climate crisis," Live Earth Co-Chair/Vice President Al Gore said in a statement. "But ultimately, corporations and governments must become global leaders taking decisive action to stop global warming."

The Live Earth concerts mark the beginning of a multi-year campaign to move individuals, corporations and governments to take action, according to a press release.

All proceeds from the shows will go to The Alliance for Climate Protection and other international non-governmental organizations.