In Pursuit of Zero.

"Those are the hardest parts to change later", points out architect Bill Maclay, author of the book The New Net Zero: Leading-Edge Design and Construction of Homes and Buildings for a Renewable Energy Future. ZERO ENERGY HOUSES BY NOW this salient fact has been hammered into architects' heads: buildings account for nearly 40 percent of carbon emissions. He notes promising indicators, such as construction of zero energy housing across climate zones, not just in California, where environmental conditions in much of the state are especially well-suited to such buildings. [Extracted from the article]