From grassroots to strategy: advancing laboratory sustainability at Utrecht university

Scientific research, especially in experimental disciplines, depends on laboratories (labs), which are among the most energy- and resource-intensive facilities within universities. Despite their significant environmental footprint, labs are often overlooked in sustainability strategies, even though their contribution is crucial to achieving institutional and global climate goals. This Utrecht university case study presents the development of Green Labs initiatives and the use of the Laboratory Efficiency Assessment Framework (LEAF) as a scalable approach towards structured sustainability practices. We conducted a partial assessment of the university-wide lab-related environmental impact and a detailed evaluation of environmental and social outcomes from LEAF-bronze (entry-level) implementation in the Department of Pharmaceutical Sciences. Results show that LEAF low-cost measures produced measurable environmental benefits while enhancing user motivation and satisfaction. Post-implementation monitoring of a 910 m2 lab-facility showed a 5% reduction in total electricity use and a 38% decrease in targeted equipment electricity use, saving 15 MWh, 2.9 t CO2e, and 1500 EUR annually. Waste segregation improved substantially, particularly in plastic and paper recycling, while hazardous waste volumes remained stable. Surveys of lab users (n = 99) and LEAF-team members (n = 18) indicated high satisfaction, increased motivation for sustainable practices, and perceived -benefits for lab organization, safety, and team cohesion. Beyond technical interventions, the findings underscore the importance of grassroots initiatives, community engagement, and institutional support in driving systemic, long-lasting change. This case study offers a replicable model for embedding sustainability in academic labs and advancing the transition toward climate-neutral, resource-efficient, and socially responsible research environments.