Assess students' ability to estimate a household's annual greenhouse gas emissions (CO2e) from electricity consumption, heating (natural gas, oil, electric heat), and transportation (private vehicle fuel use, public transit, short air travel). Using provided or typical activity data and standard emission factors, students must perform unit conversions, calculate sector and household totals, evaluate uncertainty, and compare two reduction scenarios. Finally, require feasible reduction strategies (behavioral changes, efficiency upgrades, fuel switching or EV adoption, renewable options) with estimated emission savings, brief cost/feasibility discussion, and a prioritized action plan for implementation.