Assess learners' ability to apply life cycle assessment (LCA) methodology to compare environmental footprints of concrete, steel, and timber for building construction, including defining system boundaries and functional units, compiling inventory data across stages (extraction, production, transport, construction, use/maintenance, end-of-life), evaluating impact categories (global warming potential, embodied energy/material depletion, carbon sequestration), analyzing sensitivity to assumptions and regional data, and making evidence-based material selection recommendations.