In the final analysis, heavy metals are like many other substances found in nature; oxygen, for example, is essential for life but can be enormously harmful and even deadly if present in sufficient concentrations. Likewise, heavy metals were shown to be essential for many human endeavors, but a growing body of evidence suggests that long-term exposure to such substances can have significant adverse health consequences.
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Carter, F.W. & Turnock, D. (2002). Environmental problems of East Central Europe. London: Routledge.
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Air Pollution: A Testament to Human History Air pollution is woven throughout the fabric of our modern life. A by-product of the manner in which we build our cities, air pollution is waste remaining from the ways we produce our goods, transport ourselves and our goods, and generate the energy to heat and light the places we live, play, and work.." (Davis, 1) The most important natural resource on which humans depend