1988 Landslide disaster was the turning point in Thai society. The major landslide hit Nakhon Si Thammarat province in the south of Thailand and the number of casualties was approx. 230*. This assumed to be caused by deforestation. After recognizing the situation, the King talked to the people in Thailand to protect the environment on December 4, 1989. This became a trigger to facilitate environmental policy and movement in Thailand. In 1992, environment-related agencies, organizations, funds, and others are established. This is the same year with the UN Earth Summit.