Final answer:
Greenhouse gases trap heat by absorbing and re-emitting long-wave infrared radiation, causing warming of the planet.
Explanation:
Greenhouse gases trap heat in the atmosphere by absorbing long-wave infrared radiation emitted from Earth, thus preventing heat loss to space and warming the planet. The molecules of greenhouse gases like carbon dioxide, water vapor, and methane absorb and re-emit this radiation back towards the Earth's surface, resulting in temperature rise.
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