National Tree Day, proudly sponsored by Toyota Australia, was co-founded in 1996 by Planet Ark and Olivia Newton-John. It has now grown in to Australia's largest community tree planting and nature protection event. Planet Ark is asking Australians to help us plant one million new native trees and shrubs across the country. National Tree Day is a call to action for all Australians to put their hands in the earth and give back to their community. Each year, about 300,000 people volunteer…