The Associated Press reports:
"I hope they're a success," De Volkskrant newspaper quoted Geldof as saying in an interview.
"But why is (Gore) actually organizing them? To make us aware of the greenhouse effect? Everybody's known about that problem for years. We are all (expletive) conscious of global warming," he said.
Geldof, former front-man of The Boomtown Rats, organized the mammoth Live Aid concerts in 1985 to benefit victims of famine in Ethiopia and the Live 8 concerts in 2005 for African debt relief. He has dedicated much of his career to advocating on behalf of humanitarian causes.
"I would only organize (Live Earth) if I could go on stage and announce concrete environmental measures from the American presidential candidates, Congress or major corporations," he told the newspaper. "They haven't got those guarantees, so it's just an enormous pop concert or the umpteenth time that, say, Madonna or Coldplay get up on stage."