Jason, I think the two crucial concepts that are missing from your discussion here <http://www.positiveliberty.com/2007/07/occasional-notes-weekend-miscellany. html> are 1) the Lockean proviso and 2) the margin of production. Fred Foldvay (cc'd) -- or his writings -- can explain this better than I can. Pointers to his writings are at http://ecolibertarian.org/.
