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I had an idea 20 years ago and still think it should be explored. Basically the whole USA should have a decreasing pollution target for personal vehicles. Let's say the measure is co2. Translate the total co2 emmission for the whole country into gallons of gas and then divide by the number of licenced drivers. Each driver is then given the ability to purchase that much gas over the course of a year. If someone doesn't want or need their full credit, they can sell them on the open market. Once their credit is used up that person is all done. This rewards people who ride motorcycles, bicycles, busses, and efficiency in general. It punishes folks who insist on driving gas hogs, boats, etc... What do people think ?