A clear, engaging and exam-focused OCR A Level Geography lesson for 10.4 Climate Modelling, designed to help students understand how scientists use the carbon cycle, feedback mechanisms and future emissions scenarios to project climate change. The lesson develops understanding of carbon stores and flows, dynamic equilibrium, positive and negative feedback, permafrost and ice–albedo feedback, climate models, future emissions scenarios, global temperature change and sea-level rise. Complex processes are broken down using accessible diagrams, feedback chains and key terminology, with regular retrieval questions, misconception checks, challenge tasks and opportunities for students to apply their knowledge. The lesson also explicitly develops A Level exam technique, encouraging students to move beyond description by explaining complete geographical chains of reasoning and considering uncertainty within climate projections. Ideal for teaching the OCR A Level Geography Climate Change / Earth’s Life Support Systems content as a complete classroom lesson or revision resource.