Things get more violent. Wind tries to find the path of least resistance, though as a fluid, so it’s taking all paths in proportion to how much resistance it has (just like electricity). If you increase the absolute resistance in one area, it reduces the relative resistance everywhere else, so you end up with increased airflow everywhere else and a reduction where you added resistance. Which means more wind outside of the turbine’s path (because it’s going to equalize that pressure differential one way or another). More flow through the same volume means higher speeds and forces (think like turning up the pressure on a tap).

But wind turbines don’t have a constant effect on wind resistance; it depends on how fast it’s spinning or how fast the wind is moving. When the wind slows, the resistance goes down, and when resistance goes down, wind speed increases. So you end up with an oscillating effect where the wind goes through cycles of strengthening, losing more energy to the turbines and weakening, which means the turbines take less energy, and the winds strengthen again. Though you’d need to be taking a significant amount of that energy to see an extreme effect like this.

Apparently taking more than 53.9% of the total wind energy in an area is enough to slow the wind to a stop (again, a violent, turbulent, oscillating stop, not a gentle end of wind).

Enough wind redirection could affect weather patterns. But we won’t run out of wind, spoiler but wind power is just indirect solar power.

I’m no scientist but I think it would take an absurd and unrealistic amount of these to have any sort of noticeable effect on average wind speeds.

Typically wind is dissipated by friction losses with the surface I think (bleeding off speed and energy by making waves, waving trees, and just rubbing against the ground) and wind is generated by heat from the sun (warm air expanding pushing against cold air, creating pressure differentials across thousands of miles).

Because wind is quick to regenerate and this does nothing to stop that the result is probably a pretty small drop in average wind speeds around the new mill and no greater ramifications than slightly less pollen travel in the spring.

The windmills will steal all the spinning from hurricanes, a bust to home owners insurance

I feel like this should be an xkcd explains (if it isn’t already one)

While it is rather complex and hard to predict, the most likely global outcomes are fewer extreme weather events and extremely mild cooling. The hairy ball theorem tells us there’s already somewhere on the globe with no wind, so it’s not that big of a deal to convert some wind into electricity. This particular approach couldn’t convert “all” wind into electricity.

https://www.sciencenewstoday.org/spinning-skies-how-earths-rotation-shapes-our-weather – We won’t run out of wind until after we start slowing down the rotation of the earth, and we watch that pretty closely to know when to add leap seconds, and I imagine it’s an just absolutely huge store of energy in the form of angular momentum (et. al.).

In theory nothing. Wind is just the flow of air from high pressure to low, which itself is caused by heating from sunlight. If uncollected, the kinetic energy of the wind would eventually be lost as heat to friction between air molecules.

It will impact weather patterns and severity. I’ve certainly not done the work on how much, nor do I really have a grasp on the scales involved, so that’s mostly a meaningless statement, but I can say with confidence the impact will be real. Just like dams affecting rivers, icecap mass affecting heat reflection, and solar panels increasing local temperatures.

Given that one of the impacts of global climate change has been increased weather severity and chaos, I am not afraid of positing that reducing the severity and chaos of the jet streams could be a good thing.

Similarly, there are some interesting projects going on surrounding the use of aerogel and other materials that could help focus sunlight at the top of the oceans, where evaporation can actually occur, that are focused on creating clean drinking water—and while I think this is a good end unto itself, a nice side benefit would be less solar energy reaching the ocean and raising the body temperature.

For once, it’s cool to hear about proposed industrial projects and their side effects and they’re maybe positive, instead of “well that sounds like it’s going to leech heavy metals into the surrounding community”

Of course, aerogel is horrible to work with and clogs if it doesn’t break, and nobody else has solved the problem of scaling up and dealing with the steam getting in the way. On the lightweight flying jet stream turbine front, well, I’ve been following development for 8 years and nobody has even solved the ‘limited supply of helium leaking away into space’ problem for starters. And it’s hard making an efficient generator so lightweight that it can fly. So we don’t have to worry about them potentially improving global weather severity just yet. Or potentially devastating our remaining populations of migratory birds!

I feel like all the responses you’re getting are probably generally correct in the context of wind at/near ground level. But I feel like sticking a bunch of these in a JET STREAM is (maybe?) an entirely different matter. Or at least it could be, and I too am curious what the potential ramifications are.

Jet stream winds are not just wind like any other, are they? Various jet streams have serious impacts on weather. If they harnessed and substantively bled off the Pacific jet stream, are there potentially grave consequences on the already variable El Niño and La Niña oscillation? If it could cause serious shifts in the weather, that would affect the livability of areas, create more dangerous weather conditions, and impact farming way around the globe from their wind farm installation.

Maybe none of these are genuine scientific concerns, but frankly I don’t trust China to do the science for the rest of us. Pretending these are genuine concerns, say they screw something up - it probably doesn’t too seriously impact Chinese weather as they harness the jet stream winds right at the point where it leaves their airspace. But the ramifications for the rest of the world could then be dire, and I’m not sure that is remotely a concern for them. Could be an economic advantage even. Two birds, one stone.