Collisions with the windows of buildings kill more birds than wind turbines do, by some orders of magnitude. And that's before we get to cats ...

(Current numbers for the US; ~250,000 per year killed by turbines, ~1,000,000,000 per year by windows. 2.4 billion/year by cats. Numbers via Dunning, B. "Wind Turbines and Birds." Skeptoid Podcast. Skeptoid Media, 7 Jan 2020. Web. 12 Jan 2020. https://skeptoid.com/episodes/4709 )

So switching to Linux might reduce the use of Windows ... but probably increases use of cat ...