In November, the Philadelphia city council approved a change to the city's charter making the Office of Sustainability a permanent office in city government. Up until that point, the office, which had been created by Mayor Nutter, existed essentially at the pleasure of the mayor. Undoubtedly because of the incredible work by the office and its director, Katherine Gajewski, the sustainability results achieved there made it relatively easy for the city's policymakers to make this office a permanent part of the administrative landscape there. This decision, and similar decisions in other cities around the country, are testament to the idea that local sustainability is not some sort of fad. It has become an important function of city government, and I expect to see more cities following in Philly's footsteps. If you read Chapters 7 and 8 in the new edition of my Taking Sustainable Cities Seriously book, you will get the distinct impression that I have been very impressed with what Philadelphia has achieved in its effort to try to become more sustainable. This is yet more evidence to support that view.