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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Global warming is a gradual increase in the earth's temperature generally due to ,
❥ The greenhouse effect caused by increased
levels of carbon dioxide , CFCs and other pollutants .
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