The German city of Hamburghas announced an ambitious plan to create, and link, an amazing 27 square miles of new and existing green space all over the city. The plan, called the "Green Network," will effectively remove all cars from the city centre and promote cycling and public transport - and it is planned to be in place by 2034.
If fully realised, the network will cover some 7000 hectares, over half the size of Boston or San Francisco.
Architect Michael Pawlyn is one of the designers behind the Eden Project, a cluster of biodomes built in a 160-year-old clay quarry in Cornwall, England. Together, these biodomes house thousands of plant species from all over the world.
In a talk at TEDxLondonCity2.0, Pawlyn shows how he builds structures that mimic nature — from bird skulls to beetle wings, from slime mold to termite mounds.