A pilot program in Denver indicates that sending mental health specialists instead of police for certain 911 calls can pay off.

Disbanding city police departments appears to have no effect on overall crime rates and leads to fewer police-related deaths, a study shows.

Increasing green space in cities could have prevented at least 34,000 deaths from all causes over two decades, a new study shows.

A new book considers urban wildlife and their place in American cities. "Cities bring together diverse creatures in new ways," says the author.

Shuttering schools increased gentrification, the study finds—but only in predominantly Black neighborhoods.

"We know it's not just different demographics alone. It's the structural, economic, and social factors that define those places..."

City environments are changing the way plants evolve, a new study of white clover, one of the few organisms present in almost every city on Earth, shows.

Housing discrimination practices dating from the 1930s, called redlining, still drive air pollution disparities in hundreds of American cities today.

"Humans do not like looking at boxes," physicist Richard Taylor says. "We need to reclaim our urban environment and put nature back into it."

Shared e-scooters and e-bikes are supposedly climate friendly, but a new study suggests they may emit more CO2 emissions than the alternatives they replace.