Green energy is any energy type that is generated from natural resources, such as sunlight, wind or water.

Green diesel is produced through hydrocracking biological oil feedstocks, such as vegetable oils and animal fats

Green building (also known as green construction or sustainable building) refers to both a structure and the application of processes that are environmentally responsible and resource-efficient throughout a building's life-cycle: from planning to design, construction, operation, maintenance, renovation, and demolition.

Greasestock was an American event held yearly in Yorktown Heights, New York.

The gray is a derived unit of ionizing radiation dose in the International System of Units.

A support structure held in place by gravity as used in offshore wind turbine installations.

A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by using only the weight of the material and its resistance against the foundation to oppose the horizontal pressure of water pushing against it. Gravity dams are designed so that each section of the dam is stable and independent of any other dam section.

Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies—are brought toward (or gravitate toward) one another.

Gravitational energy or gravitational potential energy is the potential energy a massive object has in relation to another massive object due to gravity.

The gravitation water vortex power plant is a type of micro hydro vortex turbine system which is capable of converting energy in a moving fluid to rotational energy using a low hydraulic head of 0.7–3 metres (2 ft 4 in–9 ft 10 in).

A graphite-moderated reactor is a nuclear reactor that uses carbon as a neutron moderator, which allows natural uranium to be used as nuclear fuel.

Graphite is a crystalline form of the element carbon with its atoms arranged in a hexagonal structure.

The first practical generator made by Z.

A governor, or speed limiter or controller, is a device used to measure and regulate the speed of a machine, such as an engine.

A freely available resource detailing known wind properties around the globe.

Established in 2005 to provide a credible and representative forum for the entire wind energy sector at an international level.

Measurement of life-cycle greenhouse gas emissions involves calculating the global-warming potential of energy sources through life-cycle assessment. The findings are presented in units of global warming potential per unit of electrical energy generated by that source.

The effect of temeparture increase over time across the globe.

Global strategic petroleum reserves (GSPR) refer to crude oil inventories (or stockpiles) held by the government of a particular country, as well as private industry, to safeguard the economy and help maintain national security during an energy crisis.

The worlds total energy consupmtion by all available resources.