Comparison between non-conventional and conventional energy system. Coal fills 27 per cent of the global energy budget. At the present rate use, it would carry its resources until the 22nd century. But the picture of oil resources is quite grim.
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Free sample Essay on Non-Conventional Energy Sources of Energy. Wood has been the most common source of energy since the advent “human beings on the earth. Population being thin everywhere it seemed to be everlasting source.
The sources of energy which have been in use for a long time, e.g., coal, petroleum, natural gas and water power.
Energy is produced mainly from non-renewable sources such as petroleum, natural gas, coal and lignite. They are usually referred to as non-renewable, because extraction from the stock depletes the usable quantity remaining.