Assess basic recall of the major greenhouse gases (carbon dioxide, methane, nitrous oxide, fluorinated gases, and water vapor) and their common natural and anthropogenic sources. Scope: identify each gas and match it to typical sources such as fossil fuel combustion, deforestation, agriculture and livestock, fertilizer use, industrial processes, refrigeration/air conditioning, wetlands, and decomposition. Intended for introductory adult learners; focus on simple identification and examples.