Barcelona is using the regenerative braking of its subways to power trains, stations, and neighborhood EV chargers. Could New York do it too?

Caring for urban trees can be a challenge. $1.5 billion from the Forest Service should help cities manage the job.

“That’s striking,” said Dominic Parker, the author of the study. “You have reservation areas where there’s populations living ...

As premiums skyrocket, voters are starting to pay attention to one of the most obscure positions on the ballot.

The Federal Housing Finance Agency has long debated an energy efficiency standard for new homes. On Monday, lawmakers ...

Most of the passengers emerging from the station in Bellvitge, a working-class neighborhood outside Barcelona, have no idea just how innovative the city’s subway system is. Using technology not unlike ...