Gabe Klein:

Cities are at the most critical juncture in our lifetimes right now, and have a huge opportunity ahead of them — if they make good choices.
 That opportunity lies in two spheres. The first: Undo a half century of terrible planning decisions around one mode, the automobile, and remake our streets in favor of people, so they can safely walk, bike, play and live as close as possible to fundamental services and their work. The second: embracing technology as well as new business and operating models to more efficiently use the infrastructure and systems we already have and to better serve the public and its future.