As frustration with inaction on climate change at the national and global level boils over, cities of all sizes and geographies just might hold the solutions we need to take action on global warming. In this episode of Out of Order, two mayors from opposite sides of the Atlantic— Marc McGovern, Cambridge, MA and and Eckart Würzner, Heidelberg, Germany— discuss the role of cities in confronting climate change and how their respective communities are innovating in the face of national gridlock.