Which Greenhouse Effect and Global Warming term is correctly associated with type or identity: “the most abundant natural greenhouse gas”, and also with “enters the atmosphere mainly through evaporation”?

Correct Answer: Option A — Water vapour. Water vapour is correct because it is the most abundant natural greenhouse gas. Water vapour is also associated with enters the atmosphere mainly through evaporation. A further identifying fact is that Water vapour is acts mainly as a climate feedback rather than the initial human forcing. Another useful fact is that Water vapour is associated with warmer air can hold more moisture. Why the other options are incorrect: Option B — Tropospheric ozone: It is a secondary air pollutant and greenhouse gas and is associated with formed by sunlight-driven reactions involving precursor pollutants. Option C — Greenhouse effect: It is a natural atmospheric warming process and is associated with occurs when gases absorb and re-emit outgoing infrared radiation. Option D — Global warming: It is a long-term rise in Earth's average surface temperature and is associated with driven currently mainly by human greenhouse-gas emissions. Exam Takeaway: Link Water vapour with “the most abundant natural greenhouse gas” and “enters the atmosphere mainly through evaporation” for quick revision.