Kristina forwarded the address of Island Press and so I had to go browse. I am an admitted book-aholic. But I did notice that I have Sustainable Landscape Construction a book published by Island Press, and a book I can vouch for. A friend had given it to me. It takes a very thourough look at sustainable landscape.
For instance, did you every wonder how much energy an acre of lawn requires?
Mowing 10-20 times per year 1.25 to 2.5 million Btu
Irrigation 16 million Btu
Fertilization 2 to 7 million Btu
Pesticides .625-2.5 times per year 2 to 5 million Btu