How do you change the world? One light bulb at a time. Lighting plays a huge part of our energy use. All of us at the U.S. Environmental Protection Agency’s (EPA’s) ENERGY STAR program would like to wish you, our partners and friends, a happy Change a Light Day today!

October 1 marks the 4th annual ENERGY STAR Change a Light Day, and we just wanted to congratulate you for either being one of the 1.9 million Americans who have taken the pledge or for participating as one of the nearly 2,000 organizations that have driven pledges since 2006. Together we have collectively saved more than $220 million and prevented the release of more than 3 billion pounds of greenhouse gases with lighting alone.