The Environmental Significance Of Cities

"Until recently, the only real environments thought worth studying were in "pristine" nature, remote areas as far as possible from the footprint of human beings. Cities, by contrast, were seen as unnatural...Now, though, ecologists are finding that cities are interesting, legitimate environments, with surprisingly high levels of biodiversity, and what's more, that understanding and protecting them may be crucial to our environmental future. "

Thanks to The Practice of New Urbanism