# Defending the Non-Aggression Principle: A Reply to Matt Zwolinski Part 5

**URL:** <https://www.libertarianism.org/podcasts/excursions/defending-the-non-aggression-principle-a-reply-to-matt-zwolinski-part-5>

**By** George H. Smith

**Published:** January 13, 2016

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George H. Smith discusses various formulations of the non-aggression principle and concludes with some remarks about the problem of pollution.

[Originally published in essay form on May 14, 2013.](https://www.libertarianism.org/essays/excursions/defending-non-aggression-principle-reply-matt-zwolinski-part-5)

_Narrated by Terence West._