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As attention to Earth Day picked up again in 1990, so did the frequency of events land celebrations on college campuses, in city parks and other gathering places around the world. But rather than spilling any more green ink writing about Earth Day 2009, I dug up the best Earth Day posters I could find spanning the last 39 years. As might be expected, the earlier posters were much more difficult to track down (mostly because there were fewer events to advertise). I also found the paucity of posters from the 1980's indicative of Reagan-era anti-environmentalist sentiment.