Correct answer
It increases the concentration of a gas that absorbs infrared radiation and contributes to warming.
CO₂ absorbs and re-emits some infrared radiation emitted by Earth. Increasing its concentration contributes to retaining more energy and warming. The natural greenhouse effect exists without vehicles; fossil-fuel emissions contribute to intensifying it. It differs from noise and should not be attributed equally to every pollutant gas.
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It always cools the atmosphere by preventing any energy retention.
It consists solely of increasing traffic noise.
It increases the concentration of a gas that absorbs infrared radiation and contributes to warming.
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