Mister, property rights and the legal system are entirely functions implemented by a centralized government. So it's not either/or. It's just a question of which centralized government mechanism we want. Trespassing laws and the legal system were created to keep my neighbor from building the extension to his house onto my lawn. I don't see how I can sue someone from the other side of the world that's polluting my air with their CO2 under the same system.

P.S. This seems right out of the mouth of Ron Paul, who to my amazement seemed to have developed some following on reddit. 'Amazing' because his ideas don't even withstand superficial scrutiny, the kind of scrutiny that forums like this apply to ideas.