Live Earth?

According to the BBC, 413 people complained about Metallica's set being cut short on the TV. I'm pleased to say I was one of them. Why bother having a global musical event to raise awareness of something if you are not going to have a wide range of artists (and actually show them)? Are metal fans not supposed to do their bit to save the earth? Or are the Beeb's producers just a bunch of wanky Q reading tossers?