Assess students' ability to estimate a household carbon footprint using simple emission factors and to apply reasoning to select and justify transportation, home energy, and diet changes that reduce emissions. Tasks include calculating approximate emissions for given scenarios, comparing options (e.g., car vs. transit, gas vs. electric heating, meat vs. plant-based meals), ranking interventions by impact and feasibility for a middle-school household, and explaining trade-offs and co-benefits like cost and health.