should be brought under strict controls. >> sean: al gore wrote it had a profound impact on his life. one of the reasons why i game so conscious of the environment and so involved with environmental issues. >> "silent spring" is often credited with paving the way for the environmental movement. it was just a time when there was a challenge to authority, stemming partly from the vietnam war. the sense that the of the country might be taking us in the wrong direction. that was carried over to environmental issues as well. >> this was read widely by people cross the nation. particularly by students. this was during the period when the student revolution was breaking out in the united states. instead of holding up chairman mao for the red book for survival they rediscovered carson's little green book.