Gregory Kats is Senior Director and director of climate change policy at Good Energies Inc., Washington, D.C. (www.goodenergies.com), an investment firm emphasizing renewable energy and environmental technologies. He was a principal author of Green Office Buildings: A Practical Guide to Development (ULI, 2005) and is the author of the forthcoming book Greening Our Built World: costs, benefits and strategies (Island Press, 2009; www.islandpress.org/Kats.

Tell me about your new book, Greening Our Built
World.