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The energy source that we actually choose depends on various factors like the cost, the ease with which it is available, the efficiency of the technology available and the environmental damage that will be caused by using that source.
It is thus debatable as to whether any source of energy is pollution free or not. Research continues in these areas to produce longer lasting devices that will cause less damage throughout their life.
Thus the energy source that we should be:
- of low
- energy efficient and
- pollution free
We may broadly classify energy sources as renewable and non- renewable sources of energy. Renewable source of energy is the source which is available in our natural environment and can be used repetitively. Sun, wind and water are renewable sources of energy.
Non-renewable source of energy is the energy source that will get depleted some day. They are also called exhaustible sources. coal and petroleum are non - renewable sources of energy.
Exploiting any energy source disturbs the environmental balance and must be harnessed judicially.
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