Global warming :
a gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants.

→ Global warming is due to an enhanced greenhouse effect. The greenhouse effect is the trapping of heat by gases in the atmosphere due to the conversion of light into heat as it strikes the earth's surface. The enhanced greenhouse effect is due to an increase in greenhouse gases in the atmosphere

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