In cities around the world, the peer-to-peer philosophies of “access over ownership” and “value unused is waste” reach a cultural and commercial tipping point. Rideshares relieve congestion. Food sharing reduces food waste. Skill sharing improves job competitiveness. The growth of collaborative consumption, which turns underutilized products into on-demand services, changes how cities function, from transportation and education to water and energy supplies. Sector-spanning sharing solutions reduce pressure on public infrastructure and services, making the zero-emissions city possible.