Monoculture is either the same crop on a field every time,
Incorrect. Crop rotation is still monoculture. Dynamic cycling is still monoculture. It only stops being monoculture when you plant and grow more types of crops from the same field at the same time.
In practice, even polyculture fields will be strips the width of whatever harvesting machine will fit, or they're tiny hand-planted fields.
Fullface masks with cheap P3 filters will work fine against pepperspray (be sure to lose the filter after you get sprayed). You can get something good enough on AliExpress for like 30 bucks, from several "we have 3M at home" brands.
For CS/CN aka teargas deployed in wide-area use, you'll definitely want an active carbon filter. Note that those will work fine on your knockoff gasmask, but the fit of it will be much worse than a proper (150 dollar) mask, so you'll definitely get some tiny exposure. It gets worse if your face isn't that of a cleanshaven white male. Note that activated carbon has a limited lifespan, whether in use or not. Technically you'll want RCA filter canisters, but those aren't in most stores.
Dutch universities: "bike parking is free. There's a bus stop in front of every building and busses are free for students. Why would we waste everyone's money just so you can park for free?"
Kittens and older cats can't always clean themselves properly. And sometimes cats just do something incredibly dumb and need rescuing..