Greenhouse gases such as carbon dioxide, methane, and nitrous oxide do not occur naturally in the atmosphere, but are only produced in significant quantities by human activities such as power generation, agriculture, land-use changes, and transportation.

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Greenhouse gases like carbon dioxide, methane, and nitrous oxide occur naturally in the atmosphere and are also produced by natural processes such as respiration, decomposition, and volcanic eruptions, in addition to human activities.

Greenhouse Gases Such as Carbon Dioxide, Methane, and Nitrous Oxide