By the mid-1970s anti-nuclear activism had moved beyond local protests and politics to gain a wider appeal and influence . Although it lacked a single co-ordinating organization the anti-nuclear movement 's efforts gained a great deal of attention , especially in the United Kingdom and United States . In the aftermath of the Three Mile Island accident in 1979 , many mass demonstrations took place . The largest one was held in New York City in September 1979 and involved 200,000 people
Three Mile Island accident
Three Mile Island accident
Environmental movement