1 invasion of forest to grow a critical economic plants common in Central. Northeast and East The forest area has been changed to become fertile farm corn, cassava or PO is changing the environment there is very extensive, and in three regions of the country Thailand. 2 invading the forest to gain access to resettlement Deforestation in this manner, clearly visible from land of estates, estates, making cooperative tribal land estates, etc., also in the North. There is a fairly limited area of plain. When the population increased, so have expanded it to earn a living from the Plains up to the top 3 placing a slash. Tribal villagers to crops by high mountains. Especially the Forest Hill area of the water stream.
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