Ok, fine. Yes, the government should impose limits on people dumping things into the air. They should impose limits on people cutting up the trees, and causing dust storms. But you know why? Because such behaviors are an in violation with the no initiation of force principal. Libertarianism isn't completely free of a concept of common good, you know? They just believe the less government intervention, the less intervention of people to whom the capital and systems in question don't even belong, the better. The less the rescources will be completely mismanaged and wasted, and the greater the quality of service will be.
Libertarianism doesn't define a Utopia.
Ever wonder why Mc. Donald's serves such a tasty burger? Because they want to! They want your money! More specifically, they want to be in business, and do business. They've won through the hardships and challenges of getting that burger to you so tastily, so they stand to be able to do it most effectively. The government, on the other hand, just decides, "This is what we'll do," and then does it, usually in a misguided and imbecillic way. Instead of trying every method and seeing what works best, akin to the free market, (they wouldn't be able to even if they tried, not enough rescources or ambition... Ever notice how when something doesn't work the government just rolls over on it?) they just try what "sounds best".