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“When questions arise of possible harmful effects of pesticides, the defenders of the products always try to narrow the scope of the inquiry to their most immediate, direct and measurable consequences and then downplay them, The critics of pesticides, on the other hand, urge that the ecosystem is strongly interconnected, highly variable and vulnerable. Thus debates around environmental impact become debates on the philosophy of nature: are things readily isolated or richly interacting? Is the average behavior of chemicals and organisms an adequate basis for decision making or must we be concerned with the unevenness of the world? Shall we "be realists" and stick to measurable costs and benefits, or shall we concern ourselves with all kinds of consequences of what we do? Gradually we see a confrontation of the world views of mechanistic reductionism and of dialectical materialism.” — Richard Levins