a new kind of environmental problem: “biological pollution,” which some environmentalists believe will be the unhappy legacy of agriculture’s shift from a chemical to a biological paradigm. (We’re already familiar with one form of biological pollution: invasive exotic species such as kudzu, zebra mussels, and Dutch elm disease.) Harmful as chemical pollution can be, it eventually disperses and fades, but biological pollution is self-replicating. Think of it as the difference between an oil spill and a disease. Once a transgene introduces a new weed or a resistant pest into the environment, it
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