Many of us think of Earth Day as a humorless event meant to make people feel bad about drinking bottled water and beating up seals, but over the years our late night comedians and sitcom writers have found funny ways to promote green living and make us laugh at the same time.
We've compiled several such moments below, ranging from David Letterman's top ten list of Earth Day pick-up lines to "South Park"'s disturbing look behind the scenes of America's favorite green holiday.
Remember to check out our other Earth Day features including blogs on the "18 Environmentally-Themed Flicks To Celebrate With" and how to make Earth Day a family affair.
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