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good old coal is out of date. >> it's becoming much cheaper than polluting sources. maybe three or five years ago it might have been the correct statement to make which is that cheaper source of energy are more polluting. but that is no longer the case. >> new technology -- >> exactly. you have solar and wind that is far cheaper than nicoany, coal d source of power. >> his investors were drawn in by subsidies offered by the government. this field of mirrors is proof that it worked. now market forces are doing the rest. >> the most important thing that has happened is the plan else have become cheaper. they're a third of what they costed three years ago. >> with each generation of solar panels getting better and cheaper in which demand and supply are growing rapidly.

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