At a sufficiently large scale, wind turbines may well impact the atmosphere in significant ways. I think the study here is preliminary to more accurate and detailed modeling in future. Notice, though, that the study suggests the overall climate impact of extremely large scale wind farms approaches nil. This is because, according to this report, wind farms increase temperature in their immediate vicinity when situated on land, but decrease temperature when situated at sea. The long term trend is likely to involve ever more sea-based wind farms. Also, the study indicates that even such large scale wind harvesting does not slow atmospheric wind speeds so much as to make wind farms uneconomic. In other words, I consider the article's headline entirely misleading as to the actual findings of the study.
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