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DDT in the United States
The use of DDT in the United States is banned, except for a limited exemption for public health uses. The ban is due in a large part to Rachael Carson's book ''Silent Spring''. DDT is still used in 22 countries.
==Initial concerns about DDT==
As early as the 1940s, scientists had begun expressing concern over possible hazards associated with DDT, and in the 1950s the government began tightening some of the regulations governing its use.〔(DDT Regulatory History: A Brief Survey (to 1975) ), U.S. EPA, July 1975.〕 However, these early events received little attention, and it was not until 1957 when the ''New York Times'' reported an unsuccessful struggle to restrict DDT use in Nassau County, New York that the issue came to the attention of the popular naturalist-author, Rachel Carson. William Shawn, editor of ''The New Yorker'', urged her to write a piece on the subject, which developed into her famous book ''Silent Spring'', published in 1962. The book argued that pesticides, including DDT, were poisoning both wildlife and the environment and were also endangering human health.〔Lear, Linda (1997). ''Rachel Carson: Witness for Nature.'' New York: Henry Hoyten.〕
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