Source reduction appears at the top of the Environmental Protection Agency's (EPA's) hierarchy because it

According to the EPA’s hierarchy, source reduction is prioritized because it addresses the

environmental impacts of materials across their entire life cycle. This includes the extraction of raw

materials, manufacturing, distribution, usage, and end-of-life management, including recycling and

disposal. By reducing the amount of material used, source reduction minimizes the environmental

footprint throughout the entire process.

Reference: The explanation aligns with the principles outlined in the EPA’s waste management

hierarchy, which emphasizes the importance of source reduction as the most preferred approach to

managing materials and waste streams12. This is also consistent with the sustainable materials

management strategies detailed in the LEED v4 Reference Guide for Interior Design and

Construction3.