arth would be much lower than they are now and life as it is today would not be possible, but with the greenhouse effect the earth’s average temperature is a more comfortable and life-supporting 60 degrees Fahrenheit. The problems that have arisen with the greenhouse effect have occurred due to the increase in atmospheric greenhouse gases. The EPA reports that data collected over the last 100 years shows that the average land surface temperature has risen between .8 and one degree Fahrenheit, precipitation has increased around one percent over the globe and the sea level has risen approximately 6-8 inches, approximately 1-2 inches of the rise caused by melting mountain glaciers and another 1-4 inches has resulted from the expansion of the ocean water as a result of the warmer ocean temperatures. Scientists believe that the increase in greenhouse gas concentration, especially of carbon dioxide, is being caused by the combustion of fossil fuels and other human activities. Fossil fuels burned to run cars and trucks, heat homes and businesses, and power factories are responsible for about 98% of the total U.S. emission of carbon dioxide, 24% of the methane emissions and 18% of nitrous oxide emissions. Also contributing a significant share of emissions is the increase in agriculture, deforestation, landfills, industrial production, and mining. Scientists predicted that in 1997 the United States was responsible for the emission of about one-fifth of the total global greenhouse gases. The total amount of future emissions depends on a range of factors, such as demographic, economic, and technological policy and institutional developments, making it difficult to estimate future emissions. Despite the difficulty scientists have made some predi

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