These cities of the future spring from the mind ... Marshall has grown more confident that society will be able to prevent a dystopian future. Nevertheless he’ll explore worst-case scenarios ...

With multi-level highways, trains that casually slice through residential buildings, and a skyline studded with brightly lit skyscrapers, the city has an otherworldly kind of futuristic charm.

City-led policy actions on public safety ... fuels at their municipal airports, and so forth. A dystopian version of this ...