Topic: Green Cities

Pedestrians stroll along the High Line in New York, Wednesday, Sept. 17, 2014, as it winds between two buildings under construction. The last stretch of the elevated walkway opens to the public Sunday, Sept. 21. (AP Photo/Kathy Willens) (AP)

Sustainability is more than "green"

Trina Hamilton, Winifred Curran - The Conversation
Oslo, Norway

Sarah Wolfe - GlobalPost