Yes, obviously building wind farms will reduce the percentage of your power generating capacity that is coal-based - on windy days, at least! My point was, however, that building wind-farms does not allow you do take coal stations off-line, or even prevent the need for building new ones, because the two types of power plant serve different needs. If you want to reduce greenhouse gases, you can replace your coal stations with nuclear power plants; you cannot replace them with wind farms.
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