Which one of the following important greenhouse gases is not conside

Which one of the following important greenhouse gases is not considered to be largely changed in its amount due to human activities?

Water vapour

Carbon dioxide

Chlorofluorocarbon

Methane

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Answer is Wrong!

This question was previously asked in

UPSC Geoscientist – 2022

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Water vapor (H₂O) is the most abundant greenhouse gas in the atmosphere. However, its concentration is primarily controlled by temperature and the water cycle (evaporation, condensation, precipitation). While the amount of water vapor *changes* in response to global warming caused by other greenhouse gases (acting as a positive feedback loop, where warmer air holds more water vapor), human activities do not directly and significantly change the *global* atmospheric concentration of water vapor through emissions in the way they do for carbon dioxide, methane, and chlorofluorocarbons. Carbon dioxide (from burning fossil fuels, deforestation), methane (from agriculture, fossil fuels), and chlorofluorocarbons (synthetic chemicals) have seen their atmospheric concentrations dramatically increased primarily due to human activities.

– Water vapor concentration is mainly controlled by temperature and natural processes.
– CO₂, CH₄, and CFCs concentrations are significantly increased by direct human emissions.
– Water vapor acts largely as a feedback to changes initiated by other greenhouse gases.

Water vapor contributes significantly to the natural greenhouse effect. Its concentration in the atmosphere varies geographically and temporally, but the overall global atmospheric burden is not primarily driven by direct human emissions like the other listed gases.

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