r than 5 million cases in a decade. However, the species of insects gradually developed a resistance to DDT and therefore posed difficulty in killing the insects.
             Unfortunately the enthusiasm for DDT began to decreases as a result of the harmful effects that DDT created. The publication of Rachel Carson's best selling
             book "Silent Spring," which was published in 1962, was one of the main sources for bringing the negative effects of DDT into perspective. Rachel Carson was a scientist,
             which issued grave warnings about pesticides, and predicted massive destruction of the planet's fragile ecosystems. In retrospect, this book launched the environmental movement, and allowed society to re-evaluate DDT's use in the environment. It was discovered that DDT was linked to the deaths of nontarget creatures, which are organisms other than those that the pesticide is intended to kill, such as birds. Many pesticide manufacturers argued with this theory, and stated that small doses of the pesticide was unable to greatly have an effect on the society. Through experimental work, it was proven that even the smallest amounts of pesticide could effect the survival and reproduction of species. More important, research demonstrated that, although concentrations were very low in the soil, atmosphere and water, concentrations were higher in plants, higher still in herbivores, and still higher as one moved up the food chain. As a result many species of birds were becoming endangered due to bioaccumulation, and thus DDT was banned from Canada and the United States of America in the 1970's. Gradually the populations of birds and other species began to increase in North America. However, DTT is still widely used in under developed countries. For example, when the last DDT manufacturing plant in the US was dismantled in 1983, it was sold to Indonesia, where it is currently manufacturing DDT. Therefore DDT still rema
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