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1. Although coal and petroleum are produced by the degradation of biomass, yet we need to conserve them. Why?
a. Coal and petroleum can get exhausted, if we use them at a rapid rate .
b. The formation of fossil fuel is a very quick process and takes a very less time for renewal .
c. It is necessary to conserve coal and petroleum for the future generation, by reducing their consumption .
a. Non conventional energy resources are non-polluting renewable sources .
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b. Non conventional energy resources are not environmental friendly or environment clean .
c. Non conventional energy resources are available in limited amount and cannot be renewed over a short period of time .
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