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Which gases contribute to the greenhouse effect?
nitrogen and helium
carbon dioxide and methane
carbon dioxide and helium
nitrogen and methane

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Answered by GPT-5 mini AI
carbon dioxide and methane

Both CO2 and CH4 absorb and re-radiate infrared radiation, contributing to the greenhouse effect. Nitrogen (N2) and helium do not significantly absorb infrared and so do not act as greenhouse gases.