ALF once said, “Public lawns are not like pizzas. You can’t just pick up the phone and order more.” It’s hard to ignore sage advice like this, so as a little inspiration for everyone this Earth Day, we’ve collected some of our favorite moments in TV’s ongoing environmental crusade—set to the tune of one of the greatest green episodes in history, Community‘s “Environmental Science,” featuring the rock band Greene Daye. Other appearances include: Captain Spock, Kristen Wiig, live-action dinosaurs, and Doogie Howser attending a very sick Mother Earth (played by Bette Midler in ABC’s unforgettable The Earth Day Special). Click through to watch our video, and let us know which “green” TV episode has been your own favorite in the comments!