Which one of the following statements is false?

Question

BlackTom AI · Accepted Answer

Question: Which one of the following statements is false?

Option 1: 'Water plays the main role in the increase in the mean global temperature referred to as global warming.' This claim is contested because while water vapor is a powerful greenhouse gas and acts as a feedback that amplifies warming, the consensus in climate science is that the primary driver of recent global warming is increases in anthropogenic greenhouse gases such as CO2, not water vapor itself. The statement overstates water's role as the main driver, making it misleading and therefore false in the intended context.

Option 2: 'Water does not cause global warming because the atmospheric lifetime of water vapor is short.' This statement mixes two concepts: water vapor indeed has a relatively short atmospheric lifetime and is not a primary forcing (it is a feedback). However, saying it does not cause global warming because of the short lifetime is misleading: water vapor contributes to warming by amplifying warming caused by other greenhouse gases. In climate science terms, it neither initiates warming on its own nor sustains long-term forcing without the initial trigger. This makes the assertion incorrect or at least inappropriately framed as a cause.

Option 3: 'The amount of energy absorbed when water evaporates is large due to its strong intermolecular forces.' During evaporation, a large amount of energy is absorbed (latent heat of vaporization), and water’s high surface tension and hydrogen bonding contribute to that large latent heat. This statement aligns with thermodynamic properties of water and is true.

Option 4: 'Water absorbs the greatest percentage of infrared radiation being emitted by the earth.' Water vapor is indeed a highly effective greenhouse gas and contributes a substantial portion of the infrared absorption. In many assessments, water vapor accounts for the largest portion of the natural greenhouse effect, though its exact share can vary with atmospheric conditions. This statement is generally considered true and consistent with standard greenhouse effect understanding.

Option 5: 'The energy when released water condenses heats the atmosphere and fuels storms.' Condensation releases latent heat, which warms the surrounding air and can intensify atmospheric circulation and storm development. This is a well-established mechanism in meteorology and is true.

In summary, evaluating each option: Option 3, 4, and 5 describe correct physical and climatic relationships; Option 3 correctly notes latent heat of vaporization, Option 4 correctly highlights water vapor’s strong IR absorption in the greenhouse effect, and Option 5 correctly identifies latent heat release during condensation as a warming mechanism. Options 1 and 2 contain overstatements or framing that misrepresent the role of water vapor: water vapor acts as a feedback rather than the sole or primary driver, and the reasoning in option 2 incorrectly attributes the lack of warming to the vapor’s short lifetime without acknowledging its feedback role. The false statement among the set, as presented, is the one asserting water plays the main role in global warming (Option 1), since this downplays the established primary role of long-lived greenhouse gases like CO2 in driving current climate change.

Which one of the following statements is false?Single choice

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