Green Energy - The 3 Alternatives at Your Finger Tips

Everyone talks about green energy and most people are for it (exceptions could be based on oil interests). Everyone is aware that oil based power pollutes and nobody in their right mind wants this, so the next point is what alternatives do we have?
We have various options for our energy needs, and these are wind power, solar power and hydroelectricity.
The implication here is that whatever energy alternative is used, it must be renewable (quite simply it doesn't run out and is

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