The definition of “sustainability” is in flux. As it pertains to construction, sustainability is constantly evolving to encompass varying approaches and priorities. In the U.S., sustainable construction is the method of creating buildings and using processes that are environmentally reliable and resource efficient throughout the building’s life cycle, including design, construction, operation, and renovation. Western Europe defines sustainable construction as a way to build that aims to reduce health and environmental impacts affected by the construction process or by buildings.