From the Earth Day website:

"Ok people, this is it. Earth Day 2008 is about you! The first Earth Day in 1970 brought more than 20 million people out into the streets to protest against environmental destruction and we changed history! Our environmental problems in 1970 were big, but climate change is bigger, and we, the people, need to take matters into our own hands immediately. That is why you need to...

Do something! - Create an event - Tell us what you did! - Register an event - Check out what's going on in your community! - Find an event Walk, Bike, Row to a major Earth Day event around the world - Together, we will solve Climate Change."

Right now there are no events listed in Australia- let's see if we can change that!