Product Guides and Directories Some of the most important people in the movement for green building are those who are compiling directories and databases of green building materials for use by builders and designers. They are at the nexus of theory and practice in green building as pertains to materials. Not only are they at the cutting-edge of green building education shaping the values of eco-buildingbut they are also instrumental in creating new green markets. Examples include the online Environmental Building Sourcebook of Austin