Also available in: Français | Español | العربية The premise behind the Sustainable Cities photo competition was simple. [[tweetable]]We wanted to learn what people around the world “see” when they…

Xueman Wang, Dini Djalal |

Also available in: العربية Are we harnessing the power of the sun? With the success of rooftop solar and other initiatives, we’re beginning to head in the right direction.   Photo: Bernd Sieker/…

Isabel Chatterton |