A comprehensive two-lesson OCR A Level Geography resource exploring natural forcing and climate change, designed to develop both secure AO1 knowledge and higher-level AO2 evaluation. Students investigate Milankovitch cycles, volcanic activity, plate tectonics and continental drift, ocean circulation, changes in solar output and natural greenhouse gases, using a consistent analytical framework to explore how each mechanism changes the climate system and assess its magnitude, spatial scale, timescale and duration. The lessons include causal-chain activities, questioning and checks for understanding, comparative significance tasks, the Mount Pinatubo example, and an OCR-style enquiry assessment supported by a Claim → Process → Evidence → Evaluation writing framework. Ideal for teaching natural causes of climate change while building the analytical and evaluative skills students need for A Level examination questions.