| http://www.w3.org/ns/prov#value | - This is a lot: the cost of replacing a coal power station with a wind or solar one are in the range of $50 - $100 per tonne of CO2 avoided (and coming down) and even this cost seems to be far too high to be politically palatable. (Let's also remember that renewables have other benefits such as reducing air pollution and reducing reliance on exhaustible forms of energy).Have you heard of this techn
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