Sophia Bush has joined the fight for the environment by filming a new public service announcement to encourage teens to go green.
The "One Tree Hill" star has teamed up with officials at the U.S. Environmental Protection Agency and campaign website DoSomething.org to promote a new online game which shows youngsters how to help in the battle against climate change.
The internet application, called eMission, is available on Facebook.com and allows users to enter a digital world where they can build and maintain habitats for wildlife and complete missions to reduce greenhouse gases through tasks such as planting trees.
Bush says, "Teens are already on Facebook playing games, so why not play one that's going to change your life for the better? Young people need to hear that they're powerful and can be leaders in change. This is the idea behind eMission."
What do you do to go green?