The mission of the Office of Sustainability & Environment (OSE) is to identify and implement cost-effective strategies to continually improve the environmental performance of Somerville city government. OSE's objective is to make Somerville a model livable and sustainable city by reducing energy costs and environmental impacts of city operations, by adopting and promoting environmentally sensitive management policies, and by advocating for programs and practices that result in a healthy and enjoyable environment for the residents of Somerville.