HED 101 Lecture Notes - Lecture 5: Nanotechnology, Sewage Sludge, Nuclear Meltdown

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It is the field of science that studies how the environment influences human health and disease. It addresses all the physical, chemical, and biological factors external to a person, and all the related factors impacting behaviors. An estimated 12. 6 million people died as a result of living or working in an unhealthy environment in 2012 i. e. 1 in 4 of total global deaths. Environmental risk factors contribute to more than 100 diseases and injuries. Population experts believe that the most critical environmental challenge today is slowing population growth. Evidence of the effects of unchecked population growth, excessive consumption, and toxic by- products of human use and waste is everywhere. Factors affecting population growth: high fertility rates lead to rapid increases in overall population in poorer countries and create a significant impact on environmental resources. India is expected to add another 600 million people by the year 2050, surpassing china as the world"s most populous country.

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