Correct answer
Carbon dioxide, CO2.
Carbon dioxide, CO2. Burning fossil fuels releases CO2 and contributes to its rising atmospheric concentration. Other greenhouse gases include methane and nitrous oxide, N2O; the latter should not be confused with the general term nitrogen oxides. Hydrocarbons should not all be treated as having no climate effect because methane is also a hydrocarbon.
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Oxygen, O2.
Molecular nitrogen, N2.
Carbon dioxide, CO2.
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