Dianne’s most notable environmental contribution was her implementation of Surrey’s Sustainability Charter as the city’s mayor in 2008. The Charter provided a long-term vision of what a safe, sustainable Surrey would look like, and outlined action steps to achieve it. She also committed Surrey to developing biofuels, following the Climate Change Action Plan, and protecting groundwater and aquatic ecosystems. As chair of the TransLink Mayors’ Council on Regional Transportation, she spearheaded the Better Surrey Rapid Transit initiative, implemented a municipal electric vehicle pilot program in Surrey, and promoted construction of electric car recharging stations. In September 2017 Dianne resigned her seat as MP to run for leader of the BC Liberals.