Test learners' ability to compute a household carbon footprint from energy use, transport, and waste by applying emission factors, unit conversions, and basic assumptions; interpret and compare results; and develop practical, quantifiable reduction strategies (e.g., energy efficiency, mode shifts, waste reduction) with brief cost/behavioral considerations. Scope includes electricity and heating fuel consumption, vehicle kilometers and fuel efficiency or alternative modes, and waste generation/recycling rates using provided or hypothetical household data.