We’ve seen wood offered as an environmentally friendly alternative to steel for the giant towers that hold power-producing turbines high off the ground. Now comes concrete as a tower candidate, although for a different reason.
You’ve probably heard about the ever-increasing backlog of US bridges needing repair or replacement.
To some people, a lichen-covered facade is an evocative sign of history; to others, it's a mess. But to a team at the Universitat Politècnica de Catalunya, it's a way of regulating buildings' temperature and improving air quality.