Live Earth

"Live Earth will use the global reach of music to engage people on a mass scale to combat our climate crisis. Live Earth will bring together more than 150 of the world's top musicians for 24-hours of music from 7 concerts across all 7 continents. Live Earth will bring together an audience of more than 2 billion at the concerts and through television, radio, film, and the Internet. That audience, and the proceeds from the event, will create the foundation for a new, multi-year global effort to combat the climate crisis led by Vice President Al Gore."
Live Earth

Live Earth is scheduled for 07-07-07.