How do we build a place which works for all?

"Globally, the United Nations estimates that the number of humans populating the planet in 2100 will range from as few as 6.2 billion—almost a billion less than today—to as many as 15.8 billion on the high end."

from: http://www.scientificamerican.com/article/human-overpopulation-still-an-issue-of-concern/