• "Understanding the Global Carbon Cycle" - Woods Hole Research Center
  Site reveiws the basics of the global carbon cycle and how fossil fuels are linked to the cycle.
• "Climate Change" - EPA
  Explains climate change, which has been linked to emissions of greenhouse gases (including CO2).
• "Greenhouse Gas Emissions" - EPA
  Explains what greenhouse gases are and how the greenhouse effect works.

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• "USGS Tracks Acid Rain" - USGS Fact Sheet FS-183-95
  Online primer defines acid rain and explains how acid rain forms and what impacts it has on the environment. Site includes color images.
• "What is Acid Rain?" - EPA
  Defines acid rain and includes links to images and additional information.

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• "Coal Resources in Environmentally-sensitive Lands Under Federal Management" - Watson, et al., USGS Open-File Report 95-631
  Online report presents estimates of coal-bearing acreage and coal tonnage in environmentally-sensitive areas and explains how these areas are dealt with. Includes plates that give detailed examples.
• "Coal-Bed Methane: Potential and Concerns" - Nuccio, V., USGS Open-File Fact Sheet 123-00
  Visit this site to learn more about the potential use of methane as an energy source, as well as some of the problems associated with its use.
• "Coalbed Methane--An Untapped Energy Resource and an Environmental Concern" - USGS Fact Sheet FS-019-97
  This site looks at the potential of using coalbed methane as an energy resource, but also considers the environmental implications associated with removing the methane from the ground.

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• "The Plain English Guide To The Clean Air Act" - EPA

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