Evaluate undergraduate students' factual recall of major greenhouse gases—carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), halogenated gases, and water vapor—by having them name each gas, identify primary anthropogenic and natural sources, state typical atmospheric lifetimes (approximate orders of magnitude), and report 100-year global warming potentials (GWP) relative to CO2; focus is on concise, accurate recall and direct comparisons.