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John Bellamy Foster, Marx’s Ecology
b. Kohei Saito, Karl Marx’s Ecosocialism: Capital, Nature, and the Unfinished Critique of Political Economy
c. John Bellamy Foster and Paul Burkett, Marx and the Earth: An Anti-Critique
d. James O'Connor, “The Second Contradiction of Capitalism,” pp. 158-177 in Natural Causes: Essays in Ecological Marxism