Saving the planet one joke at a time. Clean cartoons on energy and environmental issues.
Global warming cartoon collection on Toon Pool. This is a great website of international cartoons.
Planet Earth - No Vacancies
Bumper Sticker with this slogan available from Cafe Press.
I think humor can be a powerful tool to promote taking care of the earth.
Earth Egg -This is your Earth on global warming.
Photo by Mark Rain (Flickr ID AZRainman) Website: http://www.azrainman.com/