| http://www.w3.org/ns/prov#value | - While Dupee said that green energy is quickly becoming more affordable, it is currently more expensive than using dirtier sources, especially coal, which is very cheap in this region. ???Electricity generated with coal is very inexpensive only because the environmental costs are not paid for in the electrical bill,??? Petersen said. ???If these costs were included in the price of coal, it would be
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