The 24-hour event on July 7 is part of a campaign, Save Our Selves—The Campaign for a Climate in Crisis, that promoters hope will trigger a broad movement to address what the former vice president calls a global climate crisis.

"In order to solve the climate crisis, we have to reach billions of people," the environmental activist, filmmaker and 2000 Democratic presidential nominee said in a statement. "The climate crisis will only be stopped by an unprecedented and sustained global movement."

Gore is often mentioned as a possible presidential candidate in 2008 despite his repeated statements that he's not running. Recently, some former aides met in Boston to discuss a campaign to draft the former vice president.

The concerts on seven continents will bring newfound publicity to Gore, who already is enjoying celebrity status with his Oscar- nominated documentary, "An Inconvenient Truth." Gore said he was thrilled that the film, on the perils of global warming, was nominated for best documentary and for best song, the latter nod coming for Melissa Etheridge's "I Need to Wake Up."

The Academy Awards are Feb. 25.

More than 100 performers are scheduled to appear at the July concerts, including Etheridge, the Foo Fighters, Lenny Kravitz, Sheryl Crow, John Mayer, Duran Duran, Korn, Pharrell, the Black Eyed Peas, Akon, Enrique Iglesias, Faith Hill and Tim McGraw.

Promoters said the Live Earth concerts will take place in Shanghai, China; Johannesburg, South Africa; Sydney, Australia; London and cities to be announced in Japan, Brazil and the United States.

Promoters said the concerts—dubbed Live Earth—could reach 2 billion people through attendance or broadcasts. Proceeds will create a foundation to combat climate change led by The Alliance for Climate Protection, which is chaired by Gore.

The Save our Selves campaign was founded by Kevin Wall, who won an Emmy as Worldwide Executive Producer of Live 8.