We are now an urban animal for the first time in human history but we are still failing to design our cities in a way which incorporates nature. “Cities need nature more than ever as we face up to a rapidly changing climate and nothing short of a green design revolution is likely to make this happen. The IUCN Urban Nature Alliance will help drive the change required by developing a standard index against which any city in the world will be able to assess and monitor the health of their green infrastructure, water and other natural capital assets