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1) Scientists have found that "over the past 250 years humans have been
artificially raising the concentration of greenhouse gases in the
atmosphere. Our factories, power plants, and cars burn coal and
gasoline and
spit out a seemingly endless stream of carbon dioxide. We produce
millions
of pounds of methane by allowing our trash to decompose in landfills
and by
breeding large herds of methane-belching cattle. Nitrogen-based
fertilizers, which we use on nearly all our crops, release unnatural
amounts
of nitrogen oxide into the atmosphere." [6] Natural forces also play a
role
in modeling. Factors such as clouds, plants, and ozone layers are used
in
some models. Society plays a role in models as well, as some
researchers
take into consideration land use changes, population increases, etc.

2) Disagreements on the exact role each element plays in a model
depends on
the individual model and its components. Information from NASA's
website......

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Approximate Word Count: 1240
Approximate Pages: 5 (250 words per double-spaced page)

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