The correct answer is Kerala.

• The Silent Valley Movement was started in 1973 by an NGO led by school teachers and the Kerala Sastra Sahithya Parishad(KSSP) to save Silent Valley from being flooded by a hydroelectric project.
• In 1970 the Kerala State Electricity Board (KSEB) proposes a hydroelectric dam across the Kunthipuzha River that runs through Silent Valley, that will submerge 8.3 sq km of untouched moist evergreen forest.
• Silent Valley is an evergreen tropical forest in the Palakkad district of Kerala, India.
• The valley was declared as Silent Valley National Park in 1985.

• In 1973 Chipko movement, was started in the Himalayan regions of U.P. (now in Uttarakhand).
• The aim of this movement was forest conservation and increase social awareness and the need to save trees, increase ecological awareness, and demonstrate the viability of people power.
• Sunderlal Bahuguna and Gaura Devi are the key people of this movement. 
• Sunderlal Bahuguna gave the slogan "Ecology is the permanent economy".