Which Greenhouse Effect and Global Warming term is correctly associated with major source or process: “emitted by livestock, wetlands, landfills and fossil-fuel systems”, and also with “warms more strongly per molecule than carbon dioxide over shorter periods”?

Correct Answer: Option B — Methane. Methane is correct because it is emitted by livestock, wetlands, landfills and fossil-fuel systems. Methane is also associated with warms more strongly per molecule than carbon dioxide over shorter periods. A further identifying fact is that Methane is warms more strongly per molecule than carbon dioxide over shorter periods. Another useful fact is that Methane is associated with it is the main component of natural gas. Why the other options are incorrect: Option A — Nitrous oxide: It is strongly linked to agricultural soils and nitrogen fertilisers and is associated with also contributes to stratospheric ozone depletion. Option C — Water vapour: It is enters the atmosphere mainly through evaporation and is associated with acts mainly as a climate feedback rather than the initial human forcing. Option D — Tropospheric ozone: It is formed by sunlight-driven reactions involving precursor pollutants and is associated with contributes to warming near Earth's surface. Exam Takeaway: Link Methane with “emitted by livestock, wetlands, landfills and fossil-fuel systems” and “warms more strongly per molecule than carbon dioxide over shorter periods” for quick revision.