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@Solar power: Right now, it's not the greatest form of electricity generation. However, there isn't any hard things preventing the efficiency from increasing. It's more a matter of R&D then anything else. In more proven parts of the silicon industry (EG computer chips) you see very fast technological progress. If the money was there, the same could be true for Solar.
Governments could speed things along if they gave solar panel developers/manufacturers greater stability through feed in tariffs and other guaranteed prices. What's holding a lot of Solar (and other renewables) back is that they're afraid that tomorrow the price of Oil/Gas will drop again, rendering what seemed like a profit making project into one making severe losses. A feed in Tariff would belay those fears, as they'd be able to make reasonable profit projections of a product that usually takes years to pay off it's initial investment.
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