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This lecture covers sustainability tools in civil engineering, focusing on Environmental Product Declarations (EPD), Life-Cycle Assessment (LCA), and opportunities for prefabrication. It explains how LCA assesses the environmental impact of a product throughout its life cycle, from raw material extraction to disposal. The use of precast concrete elements in controlled factory conditions is highlighted for its environmental benefits and structural efficiency. The 3Rs principle (Reduce, Reuse, Recycle) is also discussed in the context of reducing waste in the building industry.