Cities Reinvented

Manhattan may be one of the world's liveliest and richest places, but the infrastructure is also severely strained so large-scale eco-friendly redevelopment is on the cards.

In the Greater Tokyo Area, the world's most populous metropolitan region, the cost of housing is astronomical; urban-planning solutions are urgently needed.

In Singapore, any green space lost in new builds must be replaced elsewhere. The city is creating a landscape of green skyscrapers that harvest rainwater and run on solar power.