Start the Green Challange With Slate and TreeHugger!

Did you know that pollution from cars costs Americans over $78 billion a year in wasted fuel? Go ahead and add that onto your medical bills, because traffic also causes lung cancer, asthma, cardiopulmonary disease, and a slew of other ailments. In fact, residents of dirty-air cities (mostly caused by auto emissions) have a two-year shorter life span than inhabitants of clean air areas. So, grab your bike and start pedaling!

Join the Slate Green Challenge with TreeHugger and help reduce our collective CO2 emissions by 20 percent. We are not asking you to go out and build a green home (although you'd get bonus points if you did!), but we are hoping our readers make a positive difference in their own lives and go on to influence others. Start anytime with a carbon footprint quiz, then move on to this week's segment on transportation. If you're one of the first 500 to complete the challenge, our friends over at I'm Organic will style you out with a new t-shirt. Good luck!

[This post was written by Brittany Jacobs, TreeHugger intern on the Slate Green Challenge.]