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        Part of FRONTLINE | NOVA
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        Global Warming: The Physics of the Greenhouse Effect

        Earth's relatively stable and hospitable average temperature is the result of a phenomenon called the greenhouse effect. The presence in the atmosphere of naturally occurring compounds, known as greenhouse gases, maintains Earth's temperature. This video segment adapted from NOVA/FRONTLINE describes how human activities are increasing greenhouse gas concentrations and explains what effect this might have on global temperatures.

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