Global dimming is the reduction in the amount of global direct irradiance at the Earth's surface that has been observed since systematic measurements began in the 1950s.

A gland is a general type of stuffing box, used to seal a rotating or reciprocating shaft against a fluid.

Similar to the Darrieus wind turbine but employing straight vertical blades attached to the mast by horizontal supports ressembling a H.

Electric power unit equal to one billion watts used per hour.

Electric power unit equal to one billion watts

In thermodynamics, the Gibbs free energy is a thermodynamic potential that can be used to calculate the maximum reversible work that may be performed by a thermodynamic system at a constant temperature and pressure.

A geyser is a spring characterized by an intermittent discharge of water ejected turbulently and accompanied by steam.

A geothermal spring is a spring produced by the emergence of geothermally heated groundwater that rises from the Earth's crust.

Geothermal power is power generated by geothermal energy.

Geothermal heating is the direct use of geothermal energy for some heating applications.

A heat pump that uses the earth as a heat exchanger to either cool or heat a building. It uses the earth as a heat source in the winter (heating) and as a heat sink (cooling) in the summer. Also known as a ground source heat pump.

Geothermal gradient is the rate of temperature change with respect to increasing depth in Earth's interior.

Geothermal resource exploration, development, and production draw on the techniques of both the mining and oil/gas industries.

Geothermal Energy is the energy which is naturally available within the earths sub subsurface. For electricity generation higher geothermal temperatures are required.

Geotechnical engineering, also known as geotechnics, is the branch of civil engineering concerned with the engineering behavior of earth materials.

American entrepreneur and engineer who introduced an AC-based power distribution network in 1886.

Geophysics is a subject of natural science concerned with the physical processes and physical properties of the Earth and its surrounding space environment, and the use of quantitative methods for their analysis.

Geophysical fluid dynamics, in its broadest meaning, refers to the fluid dynamics of naturally occurring flows, such as lava flows, oceans, and planetary atmospheres, on Earth and other planets.

Geometric Dimensioning and Tolerancing is a system for defining and communicating engineering tolerances.

Geology is an Earth science concerned with the solid Earth, the rocks of which it is composed, and the processes by which they change over time.