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Essence of RES is derivation from natural processes so the energy is sustainable and never run out.Truly, renewable energy is really important and necessary to human beings when fossil fuels are more and more exhausted.Although it is obvious to recognize the human as well as environmental advantages of utilizing renewable forms of energy, we must also consider some limiting sides from the energy.
According Global Wind Energy Council (GWEC) (2008) reported that turbine installation costs $ 47.5 billion; by contrast, we only have to spend a much smaller amount of money to build thermal power station about $ 2,25 billion (Shah 2011).
He also pointed that other incidental costs such as maintenance costs and production costs cause price increasing.
For example, wind turbines or solar panel systems can provide energy and provide rural communities with new tax revenue.
Farmers on windy lands can lease space to wind developers, earning thousands of dollars for each turbine every year.
With the never-ending supply of renewables, we would feel secure when having abundant supply of energy to last our planet, our human race and our economies, for generations and ever.
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Khemani (2011) says: “As long as human life is there, there will be earth, sun, wind and water, and the energy from these sources will also be available as long as they are there”.
On the contrary, renewable energy has little or no waste products such as carbon dioxide or other chemical pollutants.
Renewable energy systems produce much lower carbon dioxide emissions as opposed to carbon-intensive fossil fuels such as oil, coal and natural gas while they are being used only a small amount of fuel during the manufacturing of equipment (Walser 2012).
Together with the rapid growth of the world population, the limited ability to supply of non-renewable leads to energy demand on a rise especially in developing countries.
This situation results in the risk of depletion of cheap fossil energy and environmental pollution as well as climate change.