Assess students' ability to estimate a household's annual carbon footprint from energy use (electricity, heating fuels), transportation (vehicle mileage, transit), and diet (food choices/consumption) by applying emissions factors and unit conversions; require clear calculations, stated assumptions, and uncertainty discussion. Students must then identify and justify practical, quantifiable reduction strategies (e.g., efficiency upgrades, travel behavior change, diet shifts), estimate potential CO2e savings, and prioritize options by feasibility and cost-effectiveness.