Marge may be the moral center of The Simpsons, but surely Lisa represents its active conscience. We have some chuckles at her expense when she moves into the tree to save it from logging. They are the tribute cynicism pays to sincerity. Mr. Burns sits at the other end of this spectrum, and there the laughs are more satisfying. I’m not sure I’ve laughed more cathartically as when he contrived to block out the sun. Still, I’m not the first to note that Mr. Burns might have been onto something with his giant, sun-blocking device. Today’s geoengineers are proposing to Read more