Assess learners' introductory understanding of the greenhouse effect and its role in Earth's climate. Test basic mechanism (how greenhouse gases trap outgoing longwave radiation), identification of major gases (CO2, CH4, N2O, water vapor), distinction between the natural versus human‑enhanced greenhouse effect, simple energy balance concepts (incoming solar vs outgoing infrared), and brief recognition of primary climate impacts and mitigation options. Suitable for short-answer, multiple-choice, and simple diagram interpretation at the adult introductory level.