We'll start out with suburbia!

“The cities will be part of the country; I shall live 30 miles from my office in one direction, under a pine tree; my secretary will live 30 miles away from it too, in the other direction, under another pine tree. We shall both have our own car. We shall use up tires, wear out road surfaces and gears, consume oil and gasoline. All of which will necessitate a great deal of work ... enough for all.”

—Le Corbusier, The Radiant City (1967)

Here's a good introduction to what sprawl is...

I'm moving to L.A. area in August, and this article talks about what problems they are facing right now in terms of sprawl and its affect.

This is an interesting thread to read... residents of California talking about there own enviroment.

Pictures of the places they are talking about