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        9-12

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        Part of FRONTLINE | NOVA
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        1900 Air Pollution

        Gases trapped in ice cores show the dramatic impact that human activities have had on the planet since the Industrial Revolution. This graph,from the Web site accompanying the FRONTLINE/NOVA special "What's Up with the Weather?," reveals how atmospheric carbon dioxide, methane, and nitrous oxides from coal- and oil-burning power plants, cars, and other fossil-fuel-burning sources have climbed along with the world population, with as yet unknown effects on the climate system.

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