If you qualify - and you think this is as great of an idea as I do - head over here: American Express - The Member's Project and vote for, 'The Virtual Forest Project. One Million Trees. Easy.'
Imagine seeing this project get one million dollars (and one million real trees planted)?
This is a prime example of using social media to make a great cause even greater. Change can happen and the democratization and decentralization of content and media is allowing little ideas to spark into big wins.
Bonus: in case you were wondering what Machinima is? The YouTube video above was done in Machinima - using a gaming or virtual world engine to create a film. You'll be hearing a lot more about Machinima and what it means to Marketers in the coming months as the channel grows in popularity.