California's attorney general has sued carmakers DaimlerChrysler, General Motors, Ford and subsidiaries of Honda, Nissan and Toyota for global warming impacts on the state. Interesting that the state isn't trying to hold individual car owners — the ones who actually drive and produce the emissions at issue — liable for the alleged damage. This suit seems rather reminiscent of the lawsuits first filed by U.S. cities against gun manufacturers in the late 1990s. Critics at the time pointed out, of course, that it's the people who actually shoot the guns who should be held liable for any damage caused by them. Congress was sufficiently alarmed by the prospects, however, to pass the Protection of Lawful Commerce in Arms Act, shielding firearms manufacturers from such extended liability claims. Perhaps the House and Senate should put their heads together on a Freedom to Traffic in Automobiles Act.