Environmental health involves those factors like survival, risk minimisation, and disease prevention, in the environment that may have an influence on people’s physical, mental or social well-being. Environmental health management concerns the intentional manipulation of the natural and built environment in order to reduce threats to human health or to provide opportunities to improve health. The conjunction of these two factors, environmental changes and population concentration, contributes to the overpopulation of a hostile environment with every conceivable pressure on water, energy, and other reserves, well as an increase in waste. Environmental changes may be radical. This is the case, for example, when displaced populations of refugees arrive in a new environment, or when peoples’ movements within their normal geographical environment are restricted. The level of economic, social and cultural development also conditions the relationship between a population and its environment to a large extent.