Energy is essential for life. We use it in factories, in cars, airplanes, trains and ships. To heat food, light our houses etc. However, energy consumption is different in different countries. Since always human beings have used energy sources to do work or produce heat. Firstly, they used domestic animals or their physical forces. After, they used the wind and the water. Then, they exploited the use of fossil fuels and nuclear energy. In the near future we hope new energy sources appear. Among the different sources of energy, renewable energy is the one which is produced continuously and are inexhaustible at a human scale. The sun is the centre of all the renewable energy sources, as its heat provokes in the Earth the differences in pressure, which produce wind that is the source of wind energy. Hydraulic energy also comes from the sun. Plants do photosynthesis, live and grow. All that organic matter is the biomass. We do not have to forget of the sun, which is the source of solar energy.
Renewable sources of energy are based on natural cycles of the planet. They are the ones which are regenerated and can be replenished in a short period of time. They are so abundant that will last for hundreds or thousands of years. This means that even if we use them a lot, our children and grandchildren will use it as well.
The renewable sources of energy used responsibly do not destroy the environment. Electricity, heating and cooling are generated by renewable energy sources such as sun, wind, agricultural residues or organic. The increment in the use of renewable sources of energy ensures a maintained generation of electricity, reducing CO2 emissions.
They can also provide employment opportunities in rural and urban areas. They are sources which respect the environment which means that they do not have a negative effect on it.
According to a study on "Environmental Impacts of Electricity Production" environmental impact in the generation of electricity from conventional energy is 31 times higher than the impact of renewable energy.
Renewable energy plays an important role in the supply of energy. When renewable energy sources are used, the demand for fossil fuels is reduced.
Unlike fossil fuels, non-biomass renewable sources of energy (hydropower, geothermal, wind, and solar) do not directly emit greenhouse gases which affect the atmosphere and harm the living beings.
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