However, some of the infrastructure is old, like the 100-year-old, 19-mile-long Mountain Tunnel, which is a key conduit for the Hetch Hetchy water flow on its route to the Bay Area. But a project ...

Shivering under a tattered blanket, a young woman tries to sleep at the foot of the mist-shrouded Entoto Mountain, north of the Ethiopian capital, Addis Ababa. Nearby, a mother and child huddle ...