Time for Change Most pesticides are manufactured compounds that are designed to kill specific pests, such as weeds and insects. Many pesticides have the potential to harm non-target organisms, especially if the organisms are exposed to high levels or for a long period of time. In the early 1960s, Rachel Carson's widely publicized book "Silent Spring" described the ecological impacts of DDT and other pesticides. Concerns about the unintended effects of pesticides continue to this …showed first 75 words of 828 total…

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