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Global Warming
Part 1 of Paper
....he sun's heat. This natural "greenhouse effect" helps keep the Earth's average temperature at a comfortable 59° Fahrenheit. Without these greenhouse gases, the Earth would
be about 0° F, like a deep- frozen snowball.
The earth's climate is predicted to change because human's are changing the chemical composition of.... Part 2 of Paper
....unts 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.... |
| Number of words: 845 - Approximate pages: 4 |
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