Which Greenhouse Effect and Global Warming term is correctly associated with type or identity: “a potent short-lived greenhouse gas”, and also with “emitted by livestock, wetlands, landfills and fossil-fuel systems”?

Correct Answer: Option A — Methane. Methane is correct because it is a potent short-lived greenhouse gas. Methane is also associated with emitted by livestock, wetlands, landfills and fossil-fuel systems. 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 B — Nitrous oxide: It is a long-lived greenhouse gas and is associated with strongly linked to agricultural soils and nitrogen fertilisers. Option C — Water vapour: It is the most abundant natural greenhouse gas and is associated with enters the atmosphere mainly through evaporation. Option D — Tropospheric ozone: It is a secondary air pollutant and greenhouse gas and is associated with formed by sunlight-driven reactions involving precursor pollutants. Exam Takeaway: Link Methane with “a potent short-lived greenhouse gas” and “emitted by livestock, wetlands, landfills and fossil-fuel systems” for quick revision.