The greatest challenge of the 21st century is filling the gap between energy demand and supply with clean, reliable and green source of energy. Energy is very essential and it is in material form in everything that is around us. The opportunity cost of obtaining the energy that we require is the impact that is made on our environment. Some energy sources have greater impacts while others have relatively lesser ones. All sources of energy affect the environment in one way or the other. There is absolutely no such thing as an entirely clean source of energy. (Boyle & University, 2004)
There are primarily two sources of energy:
Non- Renewable Energy Sources- These sources of energy cannot be replenished. They have been used as a source of energy for thousands of years. Oil, natural gas, coal, uranium (all commonly known as fossil fuels) are examples of non-renewable sources...
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