what do you mean by 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—refers to the general increase in the earth's average temperature, which causes changes in climate patterns across the globe. ... Greenhouse gases are in the atmosphere, absorbing and holding heat, which causes earth's temperature to rise.
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