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Sonali Aggarwal 7 years, 7 months ago
Coal and petroleum are fossil fuels and a nonrenewable source of energy.They are said to be nonrenewable as they take thousands of years in renewing themselves. Since we have been using them for so many years they are near to exhaustion. So it is high time for us to use them judiciously and also begin using nonconventional or renewable .sources of energy like tidal energy, solar energy
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