You’re correct that a tree or an animal (or nature as a whole) doesn’t care whether the pollution comes from a communist system or a capitalist one (or from humans or Martians). However, environment concerns are not independent of economic (or otherwise political) systems–different systems tend to produce different amounts of pollution. You’ve heard of the green ceiling? For anyone that hasn’t, it’s the theory that people don’t care about protecting the environment unless they’re above a certain level of material wealth. Above that level, citizens begin to lobby their government to enact environmental regulations. Under this idea, a democratic, capitalist based system will be much better at protecting the environment than will other systems of organizing political and economic activity.
I disagree with your definition of artificial here. Very little of anything in the market happens “naturally” (with the probably exception of greed the feeling of ownership). Modern notions of things like property rights and the rule of law did not (and probably cannot) spontaneously evolve without government help. I don’t see market-mechanism based controls on pollution to be an artificial infringement into the market any more than any other potential extensions of property rights (example: I’ve heard it suggested that we should privatize some of the EM spectrum for broadcast TV or radio). This isn’t artificial, merely our society’s progress in better understanding what should and should not be considered property.
That is what is being attempted with pollution credits. We’re trying to find a way to place the effects of pollution into the framework of the market as a whole, rather than using more contra-market ideas.
Perhaps we could allow private companies to rent pollution credits to other private entities. This would allow market mechanisms to set the price for a pollution credit yearly purchase. The magic of this mechanism is that the seller does not need to know “how hard it is to fix the other guy’s pollution”, the seller must simply know how much the buyer is willing to pay for the pollution credit. As long as the supply of pollution credits is kept reasonably low, market mechanisms will cause the price to rise and punish the worst polluters, provide more economic incentive for borderline businesses to clean up their act, and the cleaner businesses find themselves having to pay less in pollution taxes, and maybe even make money off pollution loans.
Obviously, the credits will have to be allocated based on geographic area.
I’m not sure I understand your objections. The pollution credits are taxed at an annual rate (which should be directed into funding cleanup efforts), and the market sets the prices and distribution of the credits such that the businesses least able to operate cleanly must pay more. Competition by businesses over the ownership of the credits will drive up the prices, and offer incentive for other businesses to operate cleanly, while guaranteeing that pollution is kept below a certain level. Why would the cause the costs of pollution to be externalized?
It may not be impossible, in the strictest sense of the word, but that does not mean that it can be done. It’s technically possible to get large amounts of matter up to fractions of the speed of light, but that doesn’t mean we can currently do it, even if cost is not a factor. We’re working with limited technology, and sometimes companies simply cannot reduce pollution below a certain level without significantly raising the price of their goods, or simply going out of business.