Today, the imperative for organizations to optimize their processes for resource efficiency and environmental performance is driven not only by regulatory and compliance requirements, but also by evolving consumer expectations and the drive to implement sustainable information systems. In this context, Green Lean Six Sigma (GLSS) is receiving increasing attention as a means of redesigning business processes to achieve greater levels of environmental performance. However, there is no universally accepted GLSS standard, and it is not entirely clear how the quality techniques employed in such projects should be applied or potentially modified to align with environmental sustainability goals. To address this gap, this study proposes a modeling tool-based GLSS approach, based on quality techniques designed as model types, with the aim of providing practitioners with a useful means of undertaking GLSS initiatives. We evaluate the solution through illustrative scenarios, expert feedback and a usability study.