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The contemporary non-conventional sources of energy like wind, tidal, solar etc. In fact, the New World was explored by man using wind-powered ships only. The nonconventional sources are available free of cost, are pollution-free and inexhaustible.
Because of the poor technologies then existing, the cost of harnessing energy from these sources was quite high. Also because of uncertainty of period of availability and the difficulty of transporting this form of energy, to the place of its use are some of the factors which came in the way of its adoption or development.
The use of fossil fuels and nuclear energy replaced totally the non-conventional methods because of inherent advantages of transportation and certainty of availability; however these have polluted the atmosphere to a great extent.
In fact, it is feared that nuclear energy may prove to be quite hazardous in case it is not properly controlled. Tidal or lunar energy as it is sometimes called, has been known to mankind since time immemorial. Various devices, particularly the mills were operated using tidal power.
The wind wheel, like the water wheel, has been used by man for a long time for grinding corn and pumping water. Ancient seamen used wind power to sail their ships. Many geothermal power plants are operating throughout the world. These non conventional sources used in the purpose of human kind and for the development of different place by using new technologies.
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