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Two additions well worth looking at:
Alan Carter's "A Radical Green Political Theory" [some assert Carter is to Anarchism what G.A. Cohen is to Marxism]
http://spot.colorado.edu/~cartera/carter.html
Graham Purchase' "Anarchism and Ecology"
I'm definitely not a fan of a priori arguments in political-social theory, but I do think it's seriously possible, though extremely unlikely, to have governance without Government and law without a State. Given the current and past history of States and the varieties of Capital-State dynamics, anti-authoritarianism has a bright and enduring future; as Graeber and many others have noted with total seriousness, we cannot bring forth the freedoms we desire through authoritarian means............
-- "C'mon Mr. Krinkle, tell me why" [Primus]