PCA Concrete Thinker
http://www.concretethinker.org
This is a resource to help professionals make sustainable design a reality through the durability, versatility and energy performance of concrete.
Whole Building Design Guide, Federal Green Construction Guide for Specifiers
http://fedgreenspecs.wbdg.org
This design guide will assist you in writing green specifications.
United States Green Building Council
http://www.usgbc.org
This website serves as a resource for green building information and LEED accreditations.
Canada Green Building Council
http://www.cagbc.org