Brownfield - The U.S. Environmental Protection Agency's (EPA) designation for existing facilities or sites that have been abandoned or underused because of real or perceived environmental contamination. The EPA sponsors an initiative to help mitigate these health risks and return the facility or land to renewed use.

Building Envelope - The entire perimeter of a building enclosed by its roof, walls and foundation. Properly designed, the envelope can minimize temperature gain or loss and moisture infiltration.

Building Integrated Photovoltaics (BIPV) - Solar panels that have been integrated into the design of the building or structure.

Building-Related Illness (BRI) - Serious and diagnosable health conditions, usually of the respiratory system, that can be attributed to specific air quality problems within a building.

Captured Rainwater - Through the use of appropriate roofing materials and gutter systems, rainwater can be harvested or collected then stored for future non-potable use such as showers and hand washing. (See also Graywater)

Carpet America Recovery Effort (CARE) - A voluntary initiative of the carpet industry and government to prevent carpet from burdening landfills, CARE focuses on developing carpet reclamation and recycling methods.

Certified Wood - Under the guidance of the Forest Stewardship Council (FSC), wood-based materials used in building construction that are supplied from sources that comply with sustainable forestry practices, protecting trees, wildlife habitat, streams and soil.

Chain of Custody - The verification of certified wood.

Chlorofluorocarbons (CFC) - A group of volatile gases believed to deplete the ozone layer of the Earth's stratosphere. These gases have been discontinued from use as refrigerants and as blowing agents used to make foam.

Clean Air Act 1972 - Ground-breaking legislation administered by the EPA that mandates specific measures to protect the air quality and respiratory health of U.S. inhabitants.

Construction Waste Management Plan (CWMP) - A plan that diverts construction debris from landfills through conscientious plans to recycle, salvage and reuse. For best results, this type of plan should also eliminate packaging of materials when possible and be carefully monitored or audited by the contractor.

Cradle-to-Cradle - A concept introduced by architect William McDonough that prescribes at the end of a product's useful life, the product will decompose entirely with no negative environmental impact; otherwise it can be used as post-consumer material when recycled into a new product.

Cradle-to-Grave - With no consideration for sustainability, these types of products are used for a period of time and then discarded, often long before their useful life is actually complete.

Daylighting - Natural daylight introduced into interior spaces and controlled specifically to reduce levels of electric lighting, minimize glare and optimize lighting quality.

Embodied Energy - All the energy used to grow, extract and manufacture a product including the amount of energy needed to transport it to the jobsite and complete the installation.

Energy Efficient - Products and systems that use less energy to perform as well or better than standard products. While some have higher up-front costs, energy-efficient products cost less to operate over their lifetime.

Energy Star® Rating - The label given by the EPA and the U.S. Department of Energy (DOE) to appliances and products that exceed federal energy efficiency standards. This label helps consumers identify products that will save energy and money.

ENERGY STAR® -labeled appliances often exceed the efficiency levels of other new products.

Environmentally Friendly - A term that refers to the degree to which a product may harm the environment, including the biosphere, soil, water and air.

Environmentally Preferable Purchasing - The federal government requires the purchase of products or services that have the least negative effect on the environment and human health in consideration of the acquisition of raw materials, manufacturing methods, packaging, distribution, recyclability, operation, maintenance and final disposal.

Pollution Prevention - Reducing the amount of energy, materials, packaging or water in the design, manufacturing or purchasing of products or materials in an effort to increase efficient use of resources, reduce toxicity and eliminate waste.

Post-Consumer - A material or finished product that served its intended use as a consumer item. It may be recycled and incorporated into building materials and identified as containing post-consumer recycled content or recovered material.

Post-Industrial or Pre-Consumer - This refers to waste produced during the manufacturing process of virgin material and rerouted from one step in the process to the next. This does not refer to recycled material.

Rapidly Renewable - Materials that are not depleted when used, but are typically harvested from fast growing sources and do not require unnecessary chemical support. Examples include bamboo, flax, wheat, wool and certain types of wood.

Recyclability - The ability of a product or material to be recovered or otherwise diverted from the solid waste stream for the purpose of recycling (EO 13101).

Recycled/Recovered Materials - Waste materials and by-products that have been recovered or diverted from solid waste but do not include those materials and by-products generated from and commonly reused within an original manufacturing process (EO 13101).

Recycling - A series of activities including collection, separation and processing by which products or materials are recovered from the solid waste stream for use in the form of raw materials in the manufacture of new products other than fuel for producing heat or power by combustion (EO 13101).

Resource Efficiency - A practice in which the primary consideration of material use begins with the concept of "Reduce - Reuse - Recycle - Repair" stated in descending order of priority. This concept may be applied in everyday life to help promote a sustainable society. In design, begin by reducing the amount of material that is specified; find ways to reuse materials, recycle products or product waste; specify products made from recycled materials; and repair or restore products instead of replacing them.

Renewable Energy - Energy harvested from sources that are not depleted when used, typically causing very low environmental impact. Examples include solar energy, hydroelectric power and wind power.

Remanufacturing - A recycling concept by which an existing product can have its useful life extended through a secondary manufacturing or refurbishing process such as remanufactured systems furniture.

High Performance Green Building - These buildings include design features that conserve water and energy; use space, materials and resources efficiently; minimize construction waste; and create healthy indoor environments.

Hydrochlorofluorocarbon (HCFC) - Though not without some negative environmental impacts, these substances are used to replace CFCs because they are less damaging to the ozone layer. HCFCs are slated to be banned along with CFCs by 2030.

Indoor Air Quality (IAQ) - The supply and introduction of adequate air for ventilation and control of airborne contaminants, acceptable temperatures and relative humidity.

Integrated Design Team - A term referring to all individuals involved in a project from very early in the design process, including the design professionals (architect, engineers, landscape architect and interior designer); the owner's representatives  (investors, developers, building users, facility managers and maintenance personnel); and the general contractor and subcontractors

Environmental Tobacco Smoke (ETS) - Tobacco smoke producing airborne, cancer-causing particles that are exhaled by smokers and inhaled by all. ETS must be entirely eliminated from any built environment that considers itself green.

Flush Out - To help ensure the indoor air quality, mechanical systems are operated for a minimum of two weeks using 100 percent outside air at the end of construction and prior to building occupancy.

Forest Stewardship Council (FSC) - A non-profit organization that created and administers a forestry certification program to assure that businesses supply trees and wood from a forest managed in an ecologically sustainable manner.

Formaldehyde - A gaseous chemical used to bind together and preserve building materials and household products. A potential carcinogen, its use should be avoided whenever possible.

Fossil Fuels - Fuels such as coal, oil and natural gas extracted from beneath the Earth's surface, often with significant environmental and political cost. These fuels are a finite resource and are non-renewable.

Graywater - Refers to wastewater coming from sinks, showers and laundry that can be collected and treated for some reuse, such as the flushing of toilets or watering of landscape. (See also Captured Rainwater.)

GreenGuard™ - Established performance-based standards to define goods such as building materials, interior furnishings, furniture, cleaning and maintenance products, electronic equipment and personal care products with low chemical and particle emissions for use indoors. The standards establish certification procedures including test methods, allowable emissions levels, product sample collection and handling, testing type and frequency, and program application processes and acceptance.

LEED™ - The Leadership in Energy and Environmental Design (LEED) Building Rating System sets industry standards for green building design.

Life-Cycle Assessment - The comprehensive examination of a product's environmental and economic effects throughout its lifetime, including raw material extraction, transportation, manufacturing, use and disposal.

Life-Cycle Cost - The amortized annual cost of a product that includes first costs, but also extends to include installation, operating, maintenance and disposal costs over the product's lifetime.

Low Toxic - This refers to the degree to which a product is poisonous to people or other living organisms.

Material Safety Data Sheets (MSDS) - Informational fact sheets that identify hazardous chemicals and health and physical hazards, including exposure limits and precautions for workers who may come into contact with these chemicals. Green design professionals review product MSDS when specifying materials and require their submittal during the shop drawing phase.

Non-Renewable - A finite resource.

Ozone Layer - Defined by the EPA as the protective layer of atmosphere, 15 miles above the ground, that absorbs some of the sun's ultraviolet rays, reducing the amount of potentially harmful radiation reaching the Earth's surface. Ozone depletion is caused by the breakdown of certain chlorine- and/or bromine-containing compounds such as CFCs or halons.