What is the carbon footprint of the Live Earth concerts on 7/7/07?

Just wondering if all those stadiums will be powered by windmills or by solar power? Just think of all the fossil fuels being burned and released into the atmosphere to power the concerts, TV cameras, transportation to get people to and from the concerts. And this will be happening on every continent. I wonder how the stars of the show are getting to the venues? My guess would be private plane, even more emissions. I have yet to see a hybrid limosine.