What does Building Life-Cycle Impact Reduction (MR) encourage?

• A. Focusing only on energy efficiency.
• B. Considering environmental impacts of building materials across their life cycle and selecting lower-impact options.
• C. Maximizing on-site waste generation.
• D. Increasing the number of permits required for construction.

Answer: (B)

The main idea is to assess environmental impacts of building materials across their life cycle and choose options with lower overall impact. This means looking beyond just how a building performs in use and considering the embodied effects from material extraction, manufacturing, transportation, installation, maintenance, and end-of-life disposal. By evaluating these life-cycle impacts and selecting products with lower embodied carbon, fewer toxins, and better recyclability, projects reduce their environmental footprint more comprehensively. The other options miss or oppose this broader perspective: focusing only on energy efficiency ignores embodied impacts; maximizing on-site waste generation directly increases material waste rather than reducing it; and increasing the number of permits is unrelated to life-cycle environmental performance.