If one of the more extreme responses to global warming comes true, driving a sports car anywhere but on a racetrack might be relegated to history's dustbin. Fast, powerful cars within a few years may be outlawed in Europe, an idea that has been raised ostensibly because Ferraris and Porsches produce too much carbon dioxide. For those who abhor sports cars as vulgar symbols of affluence (along with vacation homes, furs and fancy jewelry), such a ban could be a two-fer: Saving the planet while cutting economic inequality. Who are these people anyway who decide on behalf of everyone what...