The document discusses the history and definition of sustainable development. It began with Rachel Carson's book "Silent Spring" in the 1960s, which sparked the environmental movement. In the 1980s, the Brundtland Commission was formed by the UN to define sustainable development. Their 1987 report introduced the now widely used definition as "development that meets the needs of the present without compromising the ability of future generations to meet their own needs." This definition balances environmental, economic, and social issues.