This year has been a watershed year for climate progress. Last month, the EPA issued new rules limiting carbon pollution from existing power plants. Today the President formally rejected Keystone XL, citing US global leadership on climate. In less than a month world leaders will convene in Paris to commit to a legally binding and global agreement limiting carbon emissions. What cannot be underestimated in all of these events is the role cities play in advancing this progress. Cities are where are bold goals (like becoming carbon neutral by 2050) get embraced, new strategies are piloted, and where residents get engaged. I am honored to be part of a city that is known for being a leader on climate and one that will continue to demonstrate that a climate friendly city is a healthy and thriving city.