Michael McElroy, a professor of environmental studies at Harvard, did an analysis of wind power with two colleagues, and here's what they report:
A network of land-based 2.5-megawatt (MW) turbines restricted to nonforested, ice-free, nonurban areas operating at as little as 20% of their rated capacity could supply >40 times current worldwide consumption of electricity, >5 times total global use of energy in all forms."
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