Her most influential work, Silent Spring (1962), exposed the ecological dangers of widespread pesticide use, especially DDT. She documented how chemicals accumulated in the food chain, harmed wildlife, contaminated water, and ultimately threatened human health. At a time when post‑WWII America strongly trusted chemical companies, her warnings were controversial and faced intense pushback from industry leaders who tried to discredit her. Despite this, her work sparked national debate and helped shift environmentalism from a niche conservation effort to a major public movement. The Kennedy administration even ordered a scientific review of her claims, which supported many of her concerns. 

Carson battled breast cancer late in her life but continued to advocate for environmental responsibility. She hid the fact that she had cancer from the public as she feared that people knowing would result in her being taken less seriously. She testified before the U.S. Senate, urging stronger regulation of chemical pesticides. Her legacy includes inspiring the creation of the Environmental Protection Agency, influencing the 1972 U.S. ban on DDT, and shaping global conservation ethics. She died in her home in Silver Spring, Maryland, on April 14, 1964, at the age of 56. Before her passing, she expressed sadness that she would be remembered mainly for Silent Spring rather than for her lifelong love of the sea, which she considered the heart of her work.