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MPEG-1  |  2012-12-18  |  14.2 MB  |  320x240  |  29.97fps  |  1 minute, 9 seconds
Transcription: Pollution is a problem that we must all worry about, but it's also important to keep it in perspective. As the graph in your book clearly shows, the amount of pollutants in the air today is significantly lower than it's been in the past 30 years. Also, it's important to realize that even though we generally think of smokestacks pouring out plumes of smoke and heavy traffic on our highways when we think of pollution, there are natural sources of pollutants as well. Lightning strikes, for example, are significant sources of both nitrogen oxides and ground level ozone. Forest fires are another si ...