US Dept of Energy, Office of Energy Efficiency and Renewable Energy
A bevy of information regarding energy-efficient building techniques, including case studies, technical reports, and fact sheets
US Green Building Council (USGBC)
Source for all things LEED-related (Leadership in Energy and Environmental Design)
Green Building Certification Institute
Search the LEED Accredited Professional Directory for LEED APs in your area; find study materials for the LEED AP exam; register as an exam candidate
American Institute of Architects' Sustainability Resource Center
A great deal of information for clients thinking about building green facilities
Toronto GREEN Development Standard (GDS)
The GDS is used as building standard for all Toronto Zoo operations, renovations, and new buildings. Toronto's Green Standard also offers guidelines for surface parking lots and a cost-benefit analysis for implementing green development.
ISO 14000 - Environmental Management Standard
The International Organization for Standards (ISO) 14000 Family of International Standards is a structured approach to addressing the environmental bottom line. ISO 14000 helps organizations to manage the impact of their activities on the environment and to demonstrate sound environmental management.