Assess graduate students' recall of the major greenhouse gases by requiring identification of each gas's chemical formula, primary anthropogenic sources, typical atmospheric lifetime (order of magnitude), and 100-year global warming potential (GWP100). Scope includes CO2, CH4, N2O, key halogenated gases (selected CFCs/HFCs, SF6), and a brief recognition of water vapor's role; answers should match standard reference values and show relative comparisons.