Answers

2014-07-21T21:40:56+05:30
Because may be that the present available resource is not enough to satisfy the needs or it may not be enough for future or the new sources of energy may be cheep and easily available .
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2014-07-21T21:47:35+05:30
We are looking for alternate sources of enery as they are becoming scarce which may effevt our future.
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