Q10 of 269 Page 161

The world's known coal reserves are expected to last for about:

Ultimate reserves designates all the coal that can eventually be mined in a given zone (that can be the whole planet).

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What steps would you suggest to reduce energy consumption?

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The major cause of environmental pollution is the use of :

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The fossil fuel whose known reserves in the earth are expected to last for the minimum period is :

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An energy efficient device for producing light is :