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At some point I saw a report on the actual numbers (was working in a big wind power company and a colleague was heading our research on this topic). One big take-away for me was that the number of bird fatalities due to windows in high-rise buildings was orders of magnitude larger than the number caused by wind turbines.

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My school, 20+ years ago had a huge glass side (possibly still does) that at just the right time of day was utterly indistinguishable from the sky to the human eye.

I sat in many an assembly to the huge "thud" of birds flying into it at full speed. The school never did anything about it in the time I was there.

This was one school with some 20-30m wide windows, imagine just a single building with an order of magnitude more glass.

The glass balcony of the flat I used to live in caused issues for birds, I imagine glass is a much, much larger issue than wind turbines given its prevalence.

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