Coal, oil, river and ocean waters, wind and certain foods are some examples of energy sources.
Energy sources or energy resources can be classified into two groups: renewable and non-renewable energy.
Some examples of renewable energies are:
Nonrenewable energies are those that are found in nature in large quantities but once depleted, they can no longer be regenerated.
They have finite reserves, as it takes a long time for their formation in nature. They are considered polluting energies, because their use causes damage to the environment.
Examples of nonrenewable energy:
The search for alternative sources of clean or renewable energy has advanced in the world. Whether to reduce dependence on oil or to lower pollution levels, the fact is that the search for different sources of energy is already a reality in the world.
In Brazil, the use of sugar cane alcohol dates from 1975, with the implementation of the National Alcohol Program (Proálcool), due to the oil crisis. Today alcohol is also used as a gasoline additive.
Similarly, the use and exploitation of solar and wind energy has been encouraged, albeit timidly, by the government.
Observe o gráfico abaixo e veja as diferentes fontes energéticas utilizadas pelo Brasil:
Energy sources are found in nature in the raw state, and to be economically harnessed they must undergo a process of transformation and storage.
Water, the sun, the wind, the oil, the coal, the uranium are channeled by the human being and thus all their ability to produce energy will be exploited.