The new three-year REU Site project will focus on Built Environment Decarbonization, which includes the manufacturing and transportation of building materials, construction, and facility operations. Eight REU students each year will address challenges requiring innovative solutions to reduce carbon emissions across the lifecycle of the built environment. Students will tackle real-world challenges in design, engineering, construction, and operations and explore ways to support the decarbonization of the built environment using advanced technologies. The program is designed to enhance participants’ understanding of how systems-level thinking and lifecycle assessments (LCA) can drive innovation in reducing carbon emissions in the built environment and related disciplines. Participants will engage in professional development activities about pursuing advanced degrees or innovation-focused careers through diverse research experiences, cutting-edge projects, and strong industry partnerships that provide real-world relevance. By offering a supportive mentorship framework, students will enhance their analytical reasoning, critical thinking, and problem-solving abilities. The project furthers the interests of the nation and supports the mission of the National Science Foundation by promoting research in the built environment and enhancing the capabilities and competitiveness of the STEM workforce. This REU Site will engage undergraduate students in conducting applied research