Energy captured from sunlight with intermediate technologies

A diesel substitute produced by extracting and chemically altering oil from plants

Liquid fuels created from processed or refined biomass

A network of interconnected transmission lines that joins power plants together and links them with end users of electricity

The application of an electric current to water molecules to split them into hydrogen and oxygen

The implementation of methods to use less energy

Alcohol made by converting starches and sugars from plant material into alcohol and CO2

A vehicle that runs on either gasoline or ethanol

Carbon in fossil fuels

An electrical-chemical device that converts fuel, such as hydrogen, into an electrical current

Heat energy that comes from the natural radioactive decay of elements deep within Earth

A technology that transfers heat from the ground to a building

Generated by the pressure of falling water

Carbon in biomass that was recently in the atmosphere

The process of removing more than is replaced by growth, typically used when referring to carbon

An energy source that cannot be used up

An energy source with a finite supply, primarily the fossil fuels and nuclear fuels

Construction designed to take advantage of solar radiation without active technology

An energy source that can be regenerated indefinitely as long as it is not overharvested

The ability of a material to maintain its temperature

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