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Mercer Island has a proud tradition of accomplishment toward sustainability. One of the earliest efforts was the formation of the Committee to Save the Earth by high school students in the early 1970s. Through the students’ fundraising, the construction and opening of the Mercer Island Recycling Center (Center) was realized in 1975. The self-supported Center was well-patronized by Islanders and, during its many years of operation, it prevented millions of pounds of recyclable materials from ending up in the landfill while contributing to the development of a sustainability ethic on Mercer Island.

In 2006, a grassroots effort of Island citizens led the City to modify the vision statement in its Comprehensive Plan to include language embracing general sustainability, and in May 2007 the City Council committed to a sustainability work program as well as a specific climate goal of reducing greenhouse gas (GHG) emissions by 80% from 2007 levels by 2050, which was consistent with King County and Washington State targets. Later in 2007, the City Council set an interim emissions reduction goal (often called a “milepost”) for City operations of 5% by 2012.

In 2012, the City convened a Sustainability Policy Taskforce, a City/community partnership, to recommend sustainability policies to the City. The City Council adopted its recommendations including dedicated staffing, incorporation of recommendations into City planning documents, development of a Sustainability Plan, and legislative actions to foster sustainability. The City’s Sustainability Manager was hired in 2013.

Numerous community groups have contributed to sustainability accomplishments in the ensuing years, and many are still active, such as IslandVision, a nonprofit organization that had encouraged and supported sustainable practices on Mercer Island and helped launch an annual Earth Day fair called Leap for Green. In 2017, Sustainable Mercer Island (SMI) emerged as an umbrella group to help coordinate various initiatives on Island and to advocate for county and state-level climate measures. It has also helped organize and publicize solarize campaigns, youth environmental education, public outreach, advocating for bicycle and pedestrian facilities, and many other activities. Some are doing research, and many are volunteering with national and local organizations working to solve the climate crisis. One volunteer leads the very successful Green Schools program for the Mercer Island School District, supported by King County Department of Natural Resources and Parks. SMI fosters waste reduction, recycling, and conservation by students and schools. IslandVision, a nonprofit organization, encourages and supports sustainable practices on Mercer Island. It provided to the City, in 2018, a technical analysis of GHG sources on Mercer Island and recommended strategies to reduce GHG emissions.

From 2010 to 2019, with the entire community’s sustainability in mind, the City has implemented a wide range of outreach programs, efficiency campaigns, alternative energy initiatives, land-use guidelines, and other natural resource management measures designed to minimize the overall impacts generated by Island residents, for the benefit of future generations. Due to the 20-year horizon envisioned by this Comprehensive Plan, it is especially appropriate to include measures that address the long-term actions needed to reduce greenhouse gas emissions, ideally in collaboration with other local governments. Actions that the City will take in the management of its own facilities and operations are addressed in the Capital Facilities Element of this Plan. In 2018, the City continued to promote and support sustainable development, through the development of green building goals and policies for all residential development.