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Alternative energy is any energy source that is an alternative to fossil fuel.

These alternatives are intended to address concerns about such fossil fuels, such as its high carbon dioxides emissions , an important factor in global warming.

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A non-renewable resource (also called a finite resource) is a resource that does not renew itself at a sufficient rate.

An example is carbon-based, organically-derived fuel. The original organic material, with the aid of heat and pressure, becomes a fuel such as oil or gas.

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Hydroelectricity is electricity produced from hydropower.

In 2015 hydropower generated 16.6% of the world's total electricity and 70% of all renewable electricity, and was expected to increase about 3.1% each year for the next 25 years.

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Renewable energy is energy that is collected from renewable sources.

Renewable energy often provides energy in four important areas: electricity generation , air and water heating/cooling, transportation , and ruble (off - grid ) energy services.

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A biofuel is a fuel that is produced through contemporary biological processes.

Biofuels can be derived directly from plants, or indirectly from agricultural, commercial, domestic, and/or industrial wastes.

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Wind power is the use of air flow through wind turbines to mechaniclly power generators for electric power.

Wind power, as an alternative to burning fossil fuels, is plentiful, renewable, widely distributed, clean, produces no green house gas, emissions during operation, consumes no water, and uses little land.

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Solar power is the conversion of energy from sunlight into electricity.

systems generate solar power by using mirrors or lenses to concentrate a large area of sunlight, or solar thermal energy, onto a small area. Electricity is generated when the concentrated light is converted to heat.

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A fossil fuel is a fuel formed by natural processes.

The age of the organisms and their resulting fossil fuels is typically millions of years, and sometimes exceeds 650 million years.

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Geothermal power is power generated  by geothermal energy.

Technologies in use include dry steam power stations, flash steam power stations and binary cycle power stations. Geothermal electricity generation is currently used in 24 countries.