If Rachel Carson were alive to mark the 50th anniversary of her book “Silent Spring,” her head would spin in both wonder and anger. Her reporting led to the eventual banning in the US of compounds such as DDT, originally hailed as miracle weapons against disease-bearing or crop-eating insects. That gave us back the bald eagle and the perigrine falcon and returned vibrant aquatic life to ponds and waterways. But we never came close to stopping the chemical barrage.
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