George Perkins Marsh was American philologist and diplomat is believed to be the first environmentalist. He recognised the irreversible impact of human actions on the Earth. It is considered to be a precursor to the sustainability concept. He also wrote the book Man and Nature. His book was one of the earliest work of ecology. He argued that humans are secured as long as man manages his resources properly and keeps them in good condition as resource scarcity can affect environmental equilibrium.
