Question

what do you mean by global warming

Answer 1

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

Hope it helps

Answer 2

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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.

Normally, this radiation would escape into space—but these pollutants, which can last for years to centuries in the atmosphere.

That's what's known as the greenhouse effect.