And possibly an illustration for the public of how the system was intended to work. I'm not sure everyone quite understands that one big difference between a c

And possibly an illustration for the public of how the system was intended to work. I'm not sure everyone quite understands that one big difference between a cap-and-trade type system and a simple excise tax is that an excise tax puts constant downward pressure on pollution, while the cap-and-trade type system only encourages the industry to reduce their externalities to whatever level the government picked as a target.