A new design theory could hold the answers to renewing urban spaces.
Around the world, mass migration from the countryside to cities surges. Cities from Los Angeles to Lagos will burst at the seams with citizens who seek new economic opportunities. Meanwhile municipal budgets will be constrained as energy prices increase, building materials become more expensive, and the fresh water supplies decline. Massive redevelopment projects that transformed Dubai, and $475m (Â£298m) open spaces like Millennium Park in Chicago are not an option for cash-strapped communities. Guardian