Learning Place? Schoolhouse Earth? This could have been better if the kids were pictured near a big rock, and the caption read "This is my favorite place to learn, Schoolhouse Rock." Then it would be mildly humorous in addition to the intended goal of sickeningly sweet.
Runners-up: Argyle Sweater, Dilbert, Frank and Ernest, Garfield, Hagar the Horrible (everyone looks horrified by the giant except Honi who looks on adoringly, there's a story here...), Mother Goose and Grimm, Red and Rover
Lots of Earth Day cartoons, some good, some bad, some bizarre. I liked this one best, as it was fairly clever. Scott Stantis does a good job using setting in his strip.
Runners-up: Big Nate, Get Fuzzy, Zits