Which Greenhouse Effect and Global Warming term is correctly associated with major source or process: “enters the atmosphere mainly through evaporation”, and also with “acts mainly as a climate feedback rather than the initial human forcing”?

Correct Answer: Option B — Water vapour. Water vapour is correct because it is enters the atmosphere mainly through evaporation. Water vapour is also associated with acts mainly as a climate feedback rather than the initial human forcing. 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 A — Tropospheric ozone: It is formed by sunlight-driven reactions involving precursor pollutants and is associated with contributes to warming near Earth's surface. Option C — Greenhouse effect: It is occurs when gases absorb and re-emit outgoing infrared radiation and is associated with keeps Earth warm enough for life. Option D — Global warming: It is driven currently mainly by human greenhouse-gas emissions and is associated with contributes to sea-level rise and changing climate extremes. Exam Takeaway: Link Water vapour with “enters the atmosphere mainly through evaporation” and “acts mainly as a climate feedback rather than the initial human forcing” for quick revision.