Environmental Research Foundation . . P.O. Box 5036, Annapolis, MD 21403 . .
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To subscribe, E-mail the words . . The environmental movement is taking a historic step forward as we speak. Other examples of persistent chemicals would include DDT, which has a half-life of roughly 20 years in the environment. There are thousands of persistent toxic chemicals and they are dangerous because they remain available for such a long time to poison plants, animals and humans. See Figure 1, which shows how the concentration of DDT is magnified 10 million times between water and birds in Long Island Sound.