For instance, one of the best strategies for reducing U.S. emissions is growing bright green, compact cities. These cities reduce emissions in all sorts of ways, e.g., by reducing the distance people drive, making infrastructure more efficient, making it possible to live wealthier lives in smaller spaces, and helping people to substitute services for products. But cities offer other economic benefits. Just as one example, people who live in walkable neighborhoods are healthier and safer than most Americans are today, meaning that this emissions reduction strategy also returns enormous economic benefits in health, longevity and emotional well-being. These sorts of benefits are almost never brought in to the economics debate about climate change. That doesn’t make the money they save us and earn us any less bankable.