Assess students' ability to recall and match the major greenhouse gases—carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and fluorinated gases (F-gases)—with their primary anthropogenic and natural sources (e.g., fossil fuel combustion, land-use change and biomass burning, agriculture and livestock, wastewater, industrial processes, and refrigerants). Scope: introductory undergraduate, factual recall and source identification.