Over a billion people celebrate Earth Day every April, making it the largest civic holiday in the world. It’s the one day when the environment gets the international attention it deserves. This year, Earth Day’s mission is to convert heightened awareness into action through the world’s largest environmental service and advocacy campaign. We call it “A Billion Acts of Green.”

Billion Acts of Green isn’t about changing your entire life around. It’s about inspiring every individual to make smart changes that, together, make an enormous difference. You can help us build the movement by sharing an awesome design based on this campaign.

Plus, 25 percent from the sale of each tee will fund Earth Day Network’s efforts to promote environmental awareness. The chosen design will be available for purchase at Threadless.

+ Earth Day T-Shirt Challenge

+ Threadless