Assess students' ability to recall and identify the major greenhouse gases—carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), fluorinated gases, and water vapor—and state their primary natural and anthropogenic sources (e.g., fossil fuel combustion, deforestation, agriculture/enteric fermentation, fertilizer use, industrial processes, refrigerants, waste decomposition). Scope: basic definitions and source examples; memory-level recall for Grade 9–12.