This is a somewhat difficult question to answer, because there are few metrics for measuring environmental impact overall. I would surmise that solar power has the least impact, as the long-term collection has just about no impact on existing conditions. As for wind, there is the concern about bird deaths. Most of the other methods seem to impact the resource in some way, whereas with solar, the sun is still going to produce the same amount of energy whether we collect it or not.
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