The Chipko movement or chipko andolan was primarily a forest conservation movement in India that began in 1973 and went on to become a rallying point for many future environmental movements all over the world. The name of the movement comes from the word 'embrace', as the villagers hugged the trees, and prevented the contractors' from felling them. Save Silent Valley was a social movement aimed at the protection of Silent Valley, an evergreen tropical forest in the Palakkad district of Kerala, India. It was started in 1973 to save the Silent Valley Reserve Forest from being flooded by a hydroelectric project. The valley was declared as Silent Valley National Park in 1984. Narmada Bachao Andolan (NBA) is a social movement consisting of adivasis, farmers, environmentalists and human rights activists against the number of large dams being built across the Narmada River, which flows through the states of Gujarat, Madhya Pradesh and Maharashtra, all over India. Sardar Sarovar Dam in Gujarat is one of the biggest dams on the river and was one of the first focal points of the movement. It is one of the many dams under the Narmada Dam Project. The main aim of the project is to provide irrigation and electricity to people in these states. Jungle Bachao Andholan: The tribals of Singhbhum district of Bihar started the protest when the government decided to replace the natural sal forests with the highly-priced teak. This move was called by many as “Greed Game Political Populism”. Later this movement spread to Jharkhand and Orissa.
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If in triangle ABC, If side AB=6√ 3, AC=12 and BC=6, then angle B equals: