Going Green

So there was a several simultaneous "green" concert some months ago. The event was touted as being about reducing global warming which is assumed to result from burning fossil fuels. Fossil fuels are burned in our cars and airplanes; and also, still, in most power plants in the form of coal. So....everyone drove or flew to the concerts. The concerts used huge amounts of electricity in the form of lights, speakers and microphones. Was the concert actually about global warming or was it an effort for Al Gore to look good?