Calvin and Hobbes by Bill Watterson for March 13, 1994
Calvin: Look at this! Some idiot dumped trash out here! People seem to forget that others of us have to live on this planet too. You know, I don't understand why humans evolved as such thoughtless, shortsighted creatures. Hobbes: Well, it can't stay that way forever. Calvin: You think we'll get smarter? Hobbes: That's one of the two possibilities. Calvin: Maybe we'll stop polluting before it's too late. Hobbes: We're all holding our breath.