Masdar Eco City
Masdar in Abu Dhabi is planned to become the world's first eco-city. Initially it will measure six square kilometres and incorporate homes for 50,000 people. Non electric cars will be banned, along with skyscapers. The city's power requirement will be predominantly generated using solar technology.
Architects have positioned buildings close enough together so they benefit from the shade of their neighbors. A novel form of public transport in the shape of magnetic podcars will taxi inhabitants around the city.
The project is expected to cost some $15 - 30 billion and to take 10 years to complete.