1. food shortage. When agricultural products are developed in a constant level compared to the number of population increased rapidly. Make poor countries such as Kenya. Ethiopia is a country where there is poverty and lack of food.2. disease. Add toxins from the environment, such as adding toxic substances from waste water from agricultural and industrial community. The smoke from the factories is causing causing harm to health of those who have been toxic. These hazardous substances which cause symptoms such as dizziness, slightly headache allergy air until a serious disease such as cancer or heart disease can cause death.3. the migration The shortage of natural resources and natural disasters, including drought, floods, such as watphai, making the population in many countries want to find migratory sources that address the social problem new. The lack of natural resources, such as social problems, causing the invading forest reserve. Cutting wood illegally poaching eating areas, etc.4. the problem of poverty is the lack of natural resources, countries that are inhaled like udon. There is a lot of population, such as drought and the country India. Bangladesh etc.
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