Volcanic eruptions, hurricanes, floods, and El Nino are naturally
occurring events over which humans have no control. But can human
activities cause additional environmental change? Can scientists
predict the global impacts of increased levels of pollutants in the
atmosphere? Will the planet warm because increased levels of
greenhouse gases, produced by the burning of fossil fuels, trap
heat and prevent it from being radiated back into space? Will the
polar ice cap melt, causing massive coastal flooding? Have humans
initiated wholesale climatic change? These are difficult questions,
with grave implications. Predicting global change and understanding
the relationships among earth's components have increased in
priority for the nation. The National Aeronautics and Space
Administration (NASA), along with many other government agencies,
has initiated long-term studies of earth's atmosphere, oceans, and
land masses using observations from satellite, balloon, and
aircraft-borne instruments. NASA calls its research program Mission
to Planet Earth. Because NASA can place scientific instruments far
above earth's surface, the program allows scientists to explore
earth's components and their interactions on a global scale.
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