Oh ok, I guess that can be an ambiguous statement.
What I meant by preserving the natural environment is taking steps to identify what pro-life attributes the natural environment offers and seeking to act in ways which does not diminish them, whenever reasonable.
Who determines when something is reasonable, and by what standard?
The only possible answer is: the owner(s) of that “natural environment”. There is no rational framework for protecting the environment outside the framework of property rights. Once you begin treating natural resources as outside the framework of property rights, all you have is socialism: a system of pseudo property rights, where ownership is assumed by those in power, in the name of “the people”.
When land and other natural resources are privately owned, the free market system will assess the value of each resource, and contracts will protect them whenever they are truly valuable.
The only exception to that is pollution. Pollution cannot be controlled and stopped at the edge of one’s property, so the government must play a role beyond just contract enforcement from time to time.
Rand argues laws aimed at curbing pollution cannot demand the impossible and cannot cause industry to cease to exist (for moral reasons in the latter case). I have not found further clarification of this point.
I remember Leonard Peikoff going into far more detail on what that entails. Unfortunately I’m not sure when and where. I most likely heard it on his podcast. I believe his site has his podcasts, and they are searchable.
One interesting point I remember is that people shouldn’t just be able to move next to an existing factory, or airport, or whatever, and sue for compensation or a ban over the pollution that’s been there since before they built their houses. Similarly, factories can’t just be allowed to start polluting more, and airports can’t just be allowed to expand more, without just compensation to surrounding residences. And that compensation should be determined by the market value of the residential properties, not some kind of arbitrary system: if a factory or airport wishes to expand, the damage the loss in value the new pollution causes to residential properties should be evaluated (it’s not hard to do: one needs only to look at the change in real estate prices in the area), and the polluters should pay it.
But that’s it. If someone chooses to stay in the area, they should have no further claim against the polluter. If they choose to move, then the cost of moving (this is somewhat more difficult to evaluate objectively, but some standards are still possible) should be added to the bill.
Of course, more often than not, that would be enough to discourage significant pollution in residential areas. After all, why would polluters choose to bear the costs of loss of property values, if they can instead just build some place far less populated. At other times, when the actual cost of the pollution is small, residents would have to just live with it. That’s what Ayn Rand meant by “cannot demand for industry to cease to exist”: some pollution, we must accept. We must let the free market set the value of “pollution free environments”, rather than assign an arbitrary value of infinite to them, and ban all pollution from ever upsetting our scheme.