Read the excerpt from Rachel Carson’s Silent Spring. There was a strange stillness. The birds, for example—where had they gone. . . . On the mornings that had once throbbed with the dawn chorus of robins, catbirds, doves, jays, wrens, and scores of other bird voices there was now no sound; only silence lay over the fields and woods and marsh. . . . No witchcraft, no enemy action had silenced the rebirth of new life in this stricken world. The people had done it to themselves.

–Rachel Carson
Silent Spring, 1962

Rachel Carson’s influence had the greatest impact during the presidency of

Richard Nixon.
Gerald Ford.
Jimmy Carter.
Ronald Reagan.