Assess students' ability to apply given emission factors and simple unit conversions to calculate an annual household carbon footprint from common energy uses (electricity, natural gas or heating oil) and personal vehicle travel. Provide sample monthly or annual consumption data and standard CO2e factors; tasks should include computing emissions for each source, summing total household CO2e, converting between units (kWh, litres, miles/km), comparing two scenarios, and recommending two practical reduction measures.