Global Warming 2

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greenhouse gases increases.


Since the beginning of the industrial revolution, great amounts of carbon dioxide have increased nearly 30%, methane concentrations have almost doubled, and nitrous oxide concentrations have risen about 15%. These increases have made the heat-trapping worse in the earth's atmosphere. Sulfate aerosols, a common air pollutant, cool the atmosphere by reflecting light back into space, but, sulfates do not live long in the atmosphere.


Why are greenhouse gas concentrations increasing? Most scientists believe that the burning of fossil fuels and other human's doings is the main reason for the increased rate of carbon dioxide. What has changed in the last few hundred years is the constante release of carbon dioxide by human's. Energy burned to run cars and trucks, heat homes and businesses, and power factories is one of the main reasons for about 80% of todays carbon dioxide problem, about 25% of U.S. methane emissions, and about 20% of ...

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