> Would child porn markets exist? How would it be prevented?
Child porn markets would most definitely exist. And no real attempt could or should be made to prevent them because the state should not impose moral values on individuals enjoying their chosen passions/hobbies/etc.
> What kinds of law would be in place?
Minimal law. There would be basic laws against the initiation of physical force, fraud, etc. Pretty much common law boiled down to its most fundamental parts.
> How would morals be made important in society where markets are eveything.
Morals? Kek. I'm not sure you're much of a libertarian if you speak in these moralistic ways. Libertarianism is about maximizing human freedom. Nothing is "good" or "bad" per se. Rather they are efficient or inefficient. We libertarians like efficient markets more than inefficient ones.
And most of us reject the retarded, backwards-looking "ethics" and "morals" based in government force and superstition. If their holy books told them to skullfuck babies, they'd do it and it would be lauded as "moral" by traditional standards.
> How would the environemnt be cared for when there's no immediate incentive to give a shit about them?
Private owners take better care of their land than governments do. Giving the huge lands gov'ts are sitting on to private owners would clear up a lot of problems.
And also, the environment is really not so important in a libertopia. If we ever see a TRUE libertarian paradise, we will have invented so many insanely advanced solutions that things like carbon taxes will seem retarded in comparison.
Basically, we're looking at the problem of environmental hazards through the lens of a retarded state-run society. Remove those problems, and you'll release the dynamic and creative energies of millions of entrepreneurs who love child porn and sell meth to children.
It will be wonderful. And also: we won't need roads. Our cars will fly and emit nicotine e-cig vapor instead of CO2.