Assess graduate-level recall of major anthropogenic greenhouse gases — e.g., CO2, CH4, N2O, SF6, and common halogenated species (CFCs/HFCs) — asking for their chemical formulas, typical atmospheric lifetimes (orders of magnitude or representative ranges), and approximate 100‑year global warming potentials (GWP100). Include direct recall, short matching, and brief comparative items (e.g., short- vs. long-lived classifications); exclude detailed radiative forcing calculations or policy analysis.