Using non-toxic, ethically, and sustainably sourced materials directly supports energy efficiency in construction. The CIPS L3M6 module notes that such materials (e.g., bamboo, recycled steel) often have lower embodied energy (energy used in production) compared to traditional options like concrete. Non-toxic properties reduce environmental harm during use, while ethical sourcing ensures minimal ecological disruption (e.g., avoiding deforestation). For instance, insulation from recycled materials improves thermal performance, cutting energy use for heating/cooling. This holistic approach aligns with LO2’s focus on reducing construction’s environmental footprint.