2. How does global warming occur?
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Answer:
Global warming occurs when carbon dioxide (CO2) and other air pollutants and greenhouse gases collect in the atmosphere and absorb sunlight and solar radiation that have bounced off the earth's surface. ... That's what's known as the greenhouse effect.
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Explanation:
co2 level increases by industries forest burns etc
co2 traps heat radiated by sun making earth a lot hotter
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