What types of agriculture tend to attract the highest concentrations of the population? Why?

Given the large numbers of tropical forests near population centers, what might the future hold for the agriculture of the region?
Southeast Asia
1. In general, around what landforms are the highest concentrations of people in the region found?
2. What have environmental issues accompanied population growth in Southeast Asia region? What are potential future issues?
3. What types of agriculture tend to attract the highest concentrations of the population? Why?
4. Given the large numbers of tropical forests near population centers, what might the future hold for the agriculture of the region?
5. With most major industrial areas located in densely populated areas, what potential environmental issues might arise? How could the region avoid such problems?