Your noise pollution example is a potentially problematic one for libertarians but the obvious answer that occurs to me is the one I would expect many thoughtful libertarians to make. You are assuming a libertarian world with largely unchanged amounts of public space which is a problematic combination. The space outside your window has no reason to be public space. You would see a lot more 'gated community' type arrangements in a more libertarian society. People with low noise tolerance could choose to live in communities where the 'public' space was owned by a municipal service provider with strict rules about noise pollution. Anyone not adhering to these rules could be ejected from the property.
Many common problems with imagined libertarian societies dissolve when you allow for much greater private ownership of currently public land than currently exists.
What's the difference between a government and a "municipal service provider"?
To whom it may concern:
This thread is for the discussion of Less Wrong topics that have not appeared in recent posts. If a discussion gets unwieldy, celebrate by turning it into a top-level post.
(After the critical success of part II, and the strong box office sales of part III in spite of mixed reviews, will part IV finally see the June Open Thread jump the shark?)