Which of the following is not a credit option for MR Building Life-Cycle Impact Reduction?

The correct answer is that achieving 95% reuse/salvage by weight is not a credit option for MR Building Life-Cycle Impact Reduction. In the context of this LEED credit, the focus is on reducing the negative environmental impacts associated with the building's life cycle, which encompasses several specific strategies for minimizing resource use and waste generation.

The criteria for MR Building Life-Cycle Impact Reduction are designed around measurable improvements and assessments tied to life-cycle impact assessments. Achieving any improvement over the required credit threshold for all six impact measures reflects the intention of LEED to encourage buildings to perform better in multiple areas of environmental impact. Similarly, using recycled materials and achieving a 10% reduction in life-cycle impact aligns with the overarching aim of the credit, which promotes sustainable practices in material sourcing and resource efficiency.

In contrast, while achieving high rates of reuse or salvage is beneficial, the specific threshold of 95% is not a recognized credit requirement in this context. This highlights the importance of understanding the specific metrics and criteria established by LEED for evaluating building practices.