Traditional sources of energy
These types of energy are most frequently used by industry. These resources include coal, oil, natural gas and nuclear fuels are non-renewable energies. An example of renewable energy is hydroelectric energy.
Alternative or green sources of energy
The word 'alternative' is used to describe souces of energy that could replace traditional energies in the future. Solar energy and wind power are the most developed alternative energies. Biomass and geothermal energies and wave power are also being investigated.
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