To celebrate the 40th anniversary of Earth Day this Thursday, April 22, the Earth911 news site is running a Twitter contest with a chance to win great prizes like the CarbonFree® Certified GoECOlife™ SOHO 8-Sheet ULTRA-QUIET™ Paper Shredder. In the 20 days leading up to Earth Day, Earth911 has been giving 2 tips a day as to how people can lead a greener lifestyle and reduce their carbon footprint. For instance, replacing one’s incandescent light bulbs with compact fluorescent light bulbs (CFLs) is a simple step that reduces energy consumption by up to 75 percent. Contestants must have a Twitter account and need only to Re-tweet the Earth Day Channel as new tips are released to be entered for a chance to win eco-friendly prizes. Up for grabs are, among other things, an Interactive Boxed Set of stationery courtesy of Ecosaurus, eco-friendly T-shirts courtesy of Earth911, and the Carbonfund.org CarbonFree® Certified GoECOlife™ shredder. Winners of the contest will be announced April 23. What are you waiting for? It’s a win-win situation: learn how to reduce your carbon footprint, share what you learn with others, and be entered for a chance at a prize!