I was surprised to realize, via a homeschooling site, that Earth Day used to be Arbor Day. And oddly the tradition of Arbor Day–to plant a tree–is and was more environmentally proactive than say, buying carbon offsets. Earth Day involves a lot of whining and chest-pounding about how mankind is damaging the environment, the importance of recycling, and hippie-esque New Age activities, which may or may not have elements of Gaia worship. On Arbor Day, people just went out and planted trees, which not incidentally, pull carbon dioxide and other pollutants out of the air.
IMHO, Arbor Day is a superior to Earth Day. So, Happy Arbor Day, everyone!