The Environment Agency has an interesting page on the sustainability of London and what needs to be done to fix the unsustainable growth and put a stop to environmental degredation.
See here for what they have to say.
To see the condition of the environment in your area, click here.
This caught my eye: “Every Londoner is using an area the size of five-and-a-half football pitches to support their way of life, which amounts to an area 250 times the city itself.”