In which year Chipko Movement was started?

Chipko movement: a very unusual form of collective action in which men and women from a village in what is now Uttarakhand were engaged in early 1973. The villagers were protesting against the practices of commercial logging that the government had permitted. They used a novel tactic for their protest that of hugging the trees to prevent them from being cut down. These protests marked the beginning of a world-famous environmental movement in our country- The Chipko Movements.