Biofuel is a liquid or gas fuel made from material derived from recently living organisms such as plants, animals and their by-products.

Building-integrated photovoltaics (BIPV) are photovoltaic materials that are used to replace conventional building materials in parts of the building envelope such as the roof, skylights, or facades.

Car sharing is a system where a fleet of cars (or other vehicles) is jointly-owned by the users in distinction from car rental or cars in private ownership.

With forest certification, an independent organization develops standards of good forest management, and independent auditors issue certificates to forest operations that comply with those standards.

Cogeneration (also called combined heat and power, or CHP) is the use of a heat engine or a power station to simultaneously generate both electricity and useful heat.

A compact fluorescent lamp (CFL), also known as a compact fluorescent light bulb, is a type of bulb designed to replace an incandescent lamp. CFLs use less energy and have a longer rated life than incandescent lamps.

Cool roof systems with high reflectance and emittance stay up to 70°F (39°C) cooler than traditional materials during peak summer weather. Benefits of cool roofs include reduced building heat-gain.

Daylighting is the practice of placing windows, or other transparent media, and reflective surfaces so that, during the day, natural light provides effective internal illumination.

Earth cooling tubes or earth warming tubes (also known as ground-coupled heat exchangers) utilize the earth's near constant subterranean temperature to warm or cool air for residential, agricultural or industrial uses.

An electric vehicle, or EV, is a vehicle with one or more electric motors for propulsion.

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