Air Pollution: Annotated Binliography

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Annotated Bibliography
"Air Pollution." GEG Project RSS2. GEG Project, n.d. Web. 29 Nov. 2012. This informative web article details the process of air pollution. In defining air pollution—when specific compounds in the atmosphere reach a point to which they cause change in the environment—it is observed that large quantities of these pollutants can be harmful. Natural processes such as volcanic eruptions decay of organic matter, and wildfires generate small amounts of air pollution. Humans, however, create far more substantial quantities that have greatly impacted the environment. An increase in outputs of pollution is the cause of acid rain, global warming, and even health risks such as heart disease and stroke. "Air Pollution." National Geographic. National Geographic Society, n.d. Web. 29 Nov. 2012. This web article focuses on two of the most common air pollutants: greenhouse gasses and sulfur dioxide. Greenhouse gasses are the main pollutants causing global warming. The most commonly emitted pollutant of this type is carbon dioxide. It is naturally produced when we breathe but most associated with cars, planes, and power plants. Methane, another greenhouse gas, is produced by gas emitted from swamps and livestock and causes destruction of the ozone layer. On the other hand, sulfur dioxide (naturally released by volcanic eruptions and the main component of smog), has the opposite effect. Instead of trapping heat, it reflects light and keeps earth cool. Industrialized countries have been working to reduce levels of sulfur dioxide, smog, and smoke in order to improve people's health. But as a result, not determined until recently, is that the lower sulfur dioxide levels may actually make global warming worse. Fears, Nikki. “Air Pollution in the U.S - Is It Getting Better or Worse?” Bright Hub. Bright Hub Inc., 19 Nov. 2010. Web. 29 Nov. 2012. Identifying and listing certain cities in the US, this article discusses whether or not air pollution has gotten...
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