Rachel Carson was concerned about what was happenig to the environment. So  in her book Silent Sping, she warned that some chemicals were poisoning the air, the water, the earth, and all its creatures. She imagined a time when spring would not bring the rebirth of flowers, trees, and the songs of birds. The book became a bestseller, and Ms. Carson was in great demand as a speaker. People listened to her because what she said made sense, and because she was a scientist who knew her facts.

Rachel Carson was primarily interested in the world of sea and shore, so she    became a marine biologst for the government. She studied and recorded facts about the sea' s plant and animal life, their special characteristics, and the nature of their environments. In 1951, she wrote The Sea Around Us, which brought her honors, fame, and respect around the world.

Ms. Carson then devoted herself full-time to research and writing. One thing   much on her mind was the effect of modern technology on the natural environment. One day, a distressed friend wrote her to say that a plane spraying(喷洒) DDT had flown over her yard, and the next day several birds lay dead. Carson decided to act.

For four years she studied the use of pesticides(杀虫剂) in the United States, and then she wrote Silent Spring.