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Of course they are realistic to use. The price of some things may be high now, but it will come down as the demand for those technologies rises. And the cost of those technologies really is much less expensive than building coal or nuclear plants or using oil.
And ftr, there is no such thing as "clean coal." We have one, count it, ONE, coal plant in this country that captures the co2. Even the plants that are in the process of being built do not capture the co2. So they are ALL "dirty coal" plants. But of course people wouldn't know that by the commercials being aired every 5 minutes on TV touting the promise of "clean coal."
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