Historically regulated by the Clean Air Act, Sulfur Dioxide (SO2) combines with other elements in the atmosphere to form sulfate aerosols that can be inhaled. ... The Title IV Clean Air Act Amendment of 1990 set forth a primary goal to reduce Sulfur Dioxide emissions by 10 million tons below levels set for 1980. ... The British firm Tesco is offering a "Trees for Petrol" program which contributes 1.5p (pounds) to the Carbon Storage Trust. The non-profit organization will use the funds to plant forests that absorb the carbon dioxide from incomplete fuel combustion. Excess carbon dioxide in ...

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• Approx Pages: 6
• Grade Level: Undergraduate

The atmospheric gases that produce the greenhouse effect include the naturally occurring substances water vapor, carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and ozone (O3), as well as artificially produced chlorofluorocarbons (CFCs). The indication is that because of human activity, such as the burning of fossil fuels, levels of greenhouse gases are now increasing, especially carbon dioxide levels. Research indicates that carbon dioxide levels in the pre-industrial era were 280 parts per million; today they are 350. ... When tropical forest is cleared for pasture land, there is a...

• Word Count: 1531
• Approx Pages: 6
• Grade Level: Undergraduate

Unpolluted rainfall is slightly acidic, with a natural pH of about 5, due to naturally occurring constituents of the atmosphere, such as carbon dioxide, but acid rain has a pH of about 4. ... Since passage (1970) of the Clean Air Act, U.S. emissions of sulfur dioxide have been reduced substantially, due to the burning of low-sulfur oil and coal, installation of costly scrubbers in smokestacks (see smoke) and electric plants, use of pollution controls by metal processors, reduction of diesel-fuel sulfur contents, and the installation of catalytic converters to clean automobile exhausts. ...

• Word Count: 632
• Approx Pages: 3
• Grade Level: Undergraduate