Aldo Loepald

Aldo Leopold was a forest official in the US in the 1920s.He designed the early polocies on widermess conversation and wild life mangement.In the 1960s,Rechel Carson published several articles that caused immediate worldwide concern on the effects of pesticides on nature and mankind. She wrote a wll-known book called silent spring,which eventually led to a change in Government Polciy and public awarness.E O wilson is an entomoligist who envinsioned that biological diversitywas a key to human srvial on Earth .He wrote Diversity of Life in 1993 .which awarded price for the best book published on environmental issues.