"Green building is the practice of increasing the efficiency with which buildings use resources -- energy, water, and materials -- while reducing building impacts on human health and the environment, through better siting, design, construction, operation, maintenance, and removal -- the complete building life cycle." (via Business Exchange)

That's one of the most clear, compact and intelligent summaries I've seen in a while! Check out more than 2,000 articles listed under the Green Building topic at the Business Exchange.