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Soon after the program collapsed, mosquito control lost access to its crucial tool, DDT. The problem was overuse—not by malaria fighters but by farmers, especially cotton growers, trying to protect their crops. The spray was so cheap that many times the necessary doses were sometimes applied. The insecticide accumulated in the soil and tainted watercourses. Though nontoxic to humans, DDT harmed peregrine falcons, sea lions, and salmon. In 1962 Rachel Carson published Silent Spring, documenting this abuse and painting so damning a picture that the chemical was eventually outlawed by most of the world for agricultural use. Exceptions were made for malaria control, but DDT became nearly impossible to procure. "The ban on DDT," says Gwadz of the National Institutes of Health, "may have killed 20 million children."
Source :National Geographic
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Banned from use in the United States 27 years ago, DDT remains the most effective pesticide in preventing the spread of malaria, which every year kills nearly 3 million people, most of whom live in poor, undeveloped countries. According to the World Health Organization, which last year launched a Rollback Malaria campaign, 300 million to 500 million new malaria cases are identified every year.
Malaria has made a dramatic comeback in certain countries in part because many nations, pressured by environmentalists, no longer use DDT for agricultural purposes.