• Focus populous => demand for housing, employment, education, healthcare, transport, ... => pressure on limited resources.
• Domestic waste => illness .
• spontaneous urbanization in developing countries => slums => sanitation conditions shabby => not ensure the health of the community.
• Clinical waste, the seed pathogens, affect the health of the community.
• Wastewater, water basins and contaminate groundwater, negative impacts on aquatic ecosystems and the people living in the watershed ...
• Emissions from transport activities industrial production and cause respiratory diseases, gastrointestinal, cardiovascular, ...
• The phenomenon of urban heat islands, regional environment centers microclimate often hotter 1/3 surrounding area.
• The pressure could exceed the capacity of the environment, beyond the capacity of the community to meet and society.
• The issue of food, employment, entertainment venues ...
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