Here’s my simple, direct, and plausible fix for my city that could be wrong. Remove most cars. I’m sure there will be people who can’t do it without cars but most people can. Fewer cars can improve the air quality and the average health of the population. The health benefits of walking are significant. Cycling and walking will become safer with fewer cars. There will be fewer car accidents. More space for coffee shops, playgrounds, and small businesses. Kids may discover that there’s a world outside of their phones.