It gets greener as you go further out.
One of the big problems in the UK has been the rise of low maintenance gardens, replacing plants with decking concrete, gravel etc.
It makes me wonder whether they know which bit is actually the City.
later on:
> Sure, you have a small/big park here and there
What big park is there within the City? The whole of the City is smaller than Hyde Park (including Kensington Gardens).