Still Silent On Spring

clipped from www.nytimes.com She cited scary figures showing a recent rise in deaths from cancer, but she didn’t consider one of the chief causes: fewer people were dying at young ages from other diseases (including the malaria that persisted in the American South until DDT). When that longevity factor as well as the impact of smoking are removed, the cancer death rate was falling in the decade before “Silent Spring,” and it kept falling in the rest of the century. Why weren’t all of the new poisons killing people? An important clue emerged in the 1980s when the biochemist Bruce Ames tested thousands of chemicals and found that natural compounds were as likely to be carcinogenic as synthetic ones. Dr. Ames found that 99.99 percent of the carcinogens in our diet were natural, But scientists like him were no match for Ms. Carson’s rhetoric. DDT became taboo even though there wasn’t evidence that it was carcinogenic (and subsequent studies repeatedly failed to prove harm to humans).