Assess students' ability to estimate a household's annual CO2e emissions from electricity and heating (using kWh and emission factors), transportation (vehicle fuel use, kilometres, public transit, and occasional flights), and diet (meat vs. plant-based consumption and food miles). Require clear calculations using provided emission factors, identification of the largest emission sources, and development of 3–5 targeted reduction measures with estimated annual CO2e savings, feasibility, and trade-offs; students must show assumptions and calculation steps.