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Nearly a fourth of the world’s energy is consumed by the United States. Most of this energy comes from burning fossil fuels, such as oil, coal, and natural gas. The availability of these fossil fuels is rapidly declining, as the world’s increasing population is proportional to its energy consumption. At the present estimated expenditure rate, the world’s reserve of fossil fuels will be depleted within the next century. This has caused great concern among developed nations to find a suitable alternative energy source.
However, this is not the only reason for concern. The burning of fossil fuels has produced a buildup of greenhouse gases in our atmosphere, which has caused an increase in the Earth’s temperature. These gases, which are carbon dioxide, methane, nitrous oxide, and chlorofluorocarbons, are known to impede the Earth’s infrared radiation from escaping into space, and thus function to sustain the Earth’s moderately warm temperature. If greenhouse gas......

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Approximate Word Count: 740
Approximate Pages: 3 (250 words per double-spaced page)

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