Sydney in Australia has become the first city to stage a Live Earth concert, a global event intended to raise awareness of climate change.Eight other cities, including London and Washington, are holding gigs.
Among the biggest names performing live are Madonna, Red Hot Chili Peppers, Metallica, The Police and Garth Brooks.
Live Earth is organised by former US Vice-President Al Gore, who described Live Earth as a "global response" to a "global problem".
"By engaging individuals all over the world, Live Earth will drive corporations and governments to tackle the climate crisis," he said.
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Live Earth: Can people make a difference?
Yes
45.17%
No
46.48%
Not sure
8.35%
9806 Votes Cast
http://news.bbc.co.uk/2/hi/entertainment/6279518.stmwatch here
http://entimg.msn.com/i/LiveEarth/player/altplayer/q.html?StreamName=Australia.smi