Which one of the following is correct about greenhouse gases?

Asked in APPSCCE 2020 Prelims 2020 · Topic: Greenhouse Effect and Climate Change (Composition, Sources, and Radiative Forcing of Major Greenhouse Gases (GHGs))

1. Water vapour is a greenhouse gas.
2. Water vapour is responsible for one-fourth of the greenhouse effect.
3. Water vapour is not the most important green‐ house gas in the atmosphere.
4. Water vapour will stay for 25 days in the at‐ mosphere.

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