Building Green: Energy Efficiency and Aesthetics From The Same Materials (Part 1,2,3)
http://www.treehugger.com/files/2007/01/building_green_2.php
http://www.treehugger.com/files/2007/01/building_green_3.php
http://www.treehugger.com/files/2007/01/building_green_4.php