Today's Washington Post carries an op-ed that should be another caution about the enthusiasm for "tradable emissions permits" for greenhouse gases or anything else: a cardiologist suggests that we adopt a colorie emissions trading program to fight obesity. In other words, this genius wants to make my cheeseburger and Popeye's fried chicken more expensive. Will people get calorie credits for exercise? More likely it will be just another disguised rationing and tax raising scheme.