"The cleanup costs of polluting a river, injecting pesticides into the ground water, or putting noxious gases into the air have not been figured into the cost of the manufacturing or agribusiness that put them there in the first place. Historically, the economic incentive has been to pollute."

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The US does not observe the free-trade principles. Those are for the weak. So agribusiness is highly subsidized and pours product into Mexico and drives out Mexican farmers. Maybe they have to go into the cities, and they don't have jobs to support them, so they flee across the border.

— Noam Chomsky