Water runs down the steps of a subway station in Berlin in 2019. Cities in the U.S. and Europe are racing to waterproof older subway systems as climate change drives more rain.

Despite its subway-hopping, block-hustling, pedestrian-proud population, the Big Apple couldn’t even crack the top 10 in a new ranking of the world’s most walkable cities — landing instead ...

Global warming is driving dangerous and disruptive flooding in underground rail systems around the world. Flooded tunnels and stations have disrupted service and stranded passengers in Boston, London, ...