A GLOBAL concert to highlight climate change will take place in London on the second anniversary of the July 7 bombings.

The 24-hour event is being billed as bigger than Live 8 and will also clash with the start of the Tour de France in London.

"Live Earth" will feature more than 100 of the biggest names in music, performing in seven cities around the world.

But the organisers, including former US vice president Al Gore, have yet to approach the UK government about a venue for the massive gig.

A Department for Media, Culture and Sport spokeswoman was unaware the event, which will feature top bands including Red Hot Chili Peppers, Bon Jovi, Keane, Snow Patrol and Foo Fighters, had even been announced.

The concert will clash with the first stage of the Tour de France which, for the first time ever, will take place in London.

An estimated two million visitors from across the world will visit the capital during the three days the world's greatest cycling race will spend in the UK.

"We have not been approached by the organisers of Live Earth for an application to the Royal Parks," the spokeswoman said.

"The Tour de France will go past the edge of Hyde Park on that day, so it will be interesting to see where they want to hold it."

The other cities involved in Live Earth are Shanghai, Johannesburg, Sydney and locations to be announced in Japan, Brazil and the US.

There will even be a concert in Antarctica.

Other acts scheduled to appear include Lenny Kravitz, Sheryl Crow and the Black Eyed Peas, as well as London's own Bloc Party and Irish singer Damien Rice.

Mr Gore launched the event in Los Angeles, flanked by actress Cameron Diaz and rapper Pharrell Williams.

"We have to get the message of urgency and hope out," said Mr Gore.

"In order to solve the climate crisis, we have to reach billions of people.

"The climate crisis will only be stopped by an unprecedented and sustained global movement."

Williams said it would be "the biggest party on earth" - hinting it would be more powerful than Bob Geldof's Live Aid and follow-up Live8.

The proceeds will create a foundation to combat climate change led by the Alliance for Climate Protection, chaired by Mr Gore.

The film featuring Mr Gore and his campaign against global warming, An Inconvenient Truth, is up for two Oscars.