The hill dwelling peoples have traditionally been primarily subsistence farmers who use slash-and-burn agricultural techniques to farm their heavily forested communities. Popular perceptions that slash and burn practices are environmentally destructive, governmental concerns over borderland security, and population pressure has caused the government to forcibly relocate many hill tribe peoples. Traditionally, hill tribes were a migratory people, leaving land as it became depleted of resources. Cultural and adventure travel tourism resulting in visiting the tribal villages is an increasing source of income for the hill tribes.