The majority of the world now lives in some form of urban environment. But as the human footprint of brick, concrete and metal expands, our proximity to nature decreases. The is a problem; nature isn't a luxury, it's a necessity. And it's vital to our wellbeing. 

From tiny urban forests in Tokyo and the star-rich skies of Flagstaff, to the meandering waters of Munich and prowling lions of Narobi, this is a globe-spanning look at how to bring nature into the places we live - and how to create the wild cities of the future.