Starting with Rachel Carson’s bestselling novel Silent Spring in 1962, the modern environmental movement began. The first Earth Day followed in 1970 as a global movement to stem the tide of pollution and damage we cause to this planet on a daily basis. The images today are from Keith’s 1970’s archives to celebrate the first Earth Day.
See the history at: https://www.earthday.org/history/
Or, maybe you can listen to Walter Cronkite