Which Greenhouse Effect and Global Warming term is correctly associated with type or identity: “a long-lived greenhouse gas”, and also with “released notably by fossil-fuel combustion and deforestation”?

Correct Answer: Option A — Carbon dioxide. Carbon dioxide is correct because it is a long-lived greenhouse gas. Carbon dioxide is also associated with released notably by fossil-fuel combustion and deforestation. A further identifying fact is that Carbon dioxide is the largest contributor to human-caused long-term warming. Another useful fact is that Carbon dioxide is associated with forests and oceans absorb part of its emissions. Why the other options are incorrect: Option B — Methane: It is a potent short-lived greenhouse gas and is associated with emitted by livestock, wetlands, landfills and fossil-fuel systems; those are the identifying facts of Methane. Option C — Nitrous oxide: It is a long-lived greenhouse gas and is associated with strongly linked to agricultural soils and nitrogen fertilisers; those are the identifying facts of Nitrous oxide. Option D — Water vapour: It is the most abundant natural greenhouse gas and is associated with enters the atmosphere mainly through evaporation; those are the identifying facts of Water vapour. Exam Takeaway: Link Carbon dioxide with “a long-lived greenhouse gas” and “released notably by fossil-fuel combustion and deforestation” for quick revision.