What is an eco-city?

A definition of "ecocity"
Future cities...
A Chinese eco-city

Questions:

1. List the problems associated with city living.
2. What is an eco-city (give your own short definition)?
3. How does an eco-city solve the problems associated with living in a city?
4. Describe a particular eco-city or eco-district (real or yet to be built).
5. If you could build an ecocity, what would you include in it and why (you can list by order of priority)?