what is global warming
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Global warming is the long-term heating of Earth's climate system observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere.
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a gradual increase in the overall temperature of the earth's atmosphere gradually attributed to the greenhouse effect causes by increased levels of carbon dioxide, CFCs, and other pollutants.
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