Live Earth Concerts

The Environmental News Service (ENS) has reported that former Vice President Al Gore launches Live Earth Concerts to fight global warming. I was starting to worry that we were going to start experiencing a shortage of theme concerts this year. Lilith Fair has been gone for years now, Lolapalooza has been coming and going, etc. Now we can go listen to some great musical acts and help fight global warming at the same time. It's great that they are trying to spread the word, but this will only work if they can show concrete proof that global warming exists and exists as a result of the human race. There are many people out there that are very skeptical that we, as humans, are responsible for this hole in the ozone layer. What are your thoughts? Global Warming: caused by humans or Earth's self regulation?