Environmental Health. A wide variety of water treatment systems and devices exist that remove or reduce unwanted chemicals and/or microorganisms through disinfection, physical filtration, adsorptive filtration, oxidation/reduction and chemical exchange reactions in order to make water potable or improve the aesthetics of the water.
Capitalism is an economic system in which the means of production of goods or services are privately owned and operated for a profit. The structure of the system allows owners and individuals to engage in whatever business they wish and does not restrict the amount of money each person is allowed to make.
Democracy, or democratic government, is a system of government in which all the people of a state or polity ... are involved in making decisions about its affairs, typically by voting to elect representatives to a parliament or similar assembly, as defined by the Oxford English Dictionary.emocracy is further defined as (a:) government by the people; especially: rule of the majority (b:)  a government in which the supreme power is vested in the people and exercised by them directly or indirectly through a system of representation usually involving periodically held free elections..