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Tax vehicles getting poor mileage and use the money to subsidize ones with good mileage. The higher the mileage the bigger the tax; the lower the mileage the bigger the subsidy. All of a sudden, hybrids and diesels are cheap, and mega-SUVs are (more) expensive.
Tax vehicles that run on only gasoline and use the money to subsidize ones that can run BioDiesel or Ethanol.
Tax (or eliminate the subsidies on) ethanol made unsustainably (uses more energy/land/other resources than it produces) and use the money to subsidize sustainable ethanol production (from corn waste or other waste biomass).
Tax Diesel #2 and use the money to subsidize BioDiesel. Heck, you could even *cut* taxes (are you listening, *?) on BioDiesel, giving it instant price-parity w/#2. Tax #2 to make up the difference, and Bio becomes *cheaper*. And watch the production capacity skyrocket.
You can do the same thing with other energy sources. Right now, if you want "green" electricity, you have to pay *more*! Tax dirty power to make clean power cheaper. Sell power on a *reverse* sliding scale--normally, the more you buy of something, the less you pay per unit. Progressive revenue-neutral taxes can turn that on its head, so it becomes *cheaper* to conserve than to waste. Where it costs less to do the right thing.
Eventually, of course, not enough people will pay extra for the "bad" stuff to subsidize the "good" stuff. But, by then, you've got the infrastructure re-directed, and economies of scale kick in to make the "good" stuff cheaper w/out a tax.
Another approach that can also be done revenue neutral, is to charge the *total* cost for a product's entire lifestyle. So, a product with excessive packaging costs more than one without, because you pay up front for the disposal costs. This can be revenue neutral, if you lower the taxes that everyone currently pays for the shared disposal costs. Thus you provide a natural incentive to "do the right thing," and at the same time charge the people who "do the wrong thing" the actual costs of that choice.
Really, you could do this with almost anything where private products incur public costs. Wal-Mart employees getting public assistance? Send 'em a bill! They will either have to charge more for their products to pay it (which will lead to people not shopping there as much), or they will do the right thing by their employees.
Look at all the things that are de-facto subsidized by the general-fund taxes that we pay--health care inequality, lack of sufficient mental health and youth services. Wasteful and environmentally destructive products and policies. Wars fought to secure profits from finite resources. Slave-labor for cheap goods and the worlds most populous country turning into a toxic-waste site. (Think all the stuff for sale at Wal-Mart is cheap? Think again!!)
Someone, somewhere, is going to have to pay all of these costs, someday. Why not account for that up front, and in the process encourage choices that will in fact cost everyone less, in the long run?
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