We’ll be brief today, because our video spotlight isn’t. But it is as culturally relevant and compelling as they come: It’s a talk by World Changing founder (and TEDster) Alex Steffen, given at the Danish Architecture Centre, where he makes a radical case for sustainable cities with 20 proposed solution spaces, each the domain of great urgency for change.

Long as it may be, the talk is altogether excellent — if there ever was a blueprint for a healthy planet still inhabited by our urbanite species, Alex Steffen has just laid it out.