"No-kill shelters" are very rare and very controversial (thanks to PETA); most still have to kill by law (overpopulation), and they instead tend to focus on not taking in more than they can handle. They are very controversial because they are more of a "moral" than a "practical" solution to animal overpopulation. They try their best to let animals have their "normal natural life to the end". They are just more focused on the animals' well-being, kind of like a library for books, but they still have to kill if they overpopulate.

The main article is written like it is the "end of the world", just like your random rambling about "climate instability" is just the natural course Earth has been on for its existence, with melting ice.

Random article about powder and stone, completely irrelevant.

The old book mentioned was just a farmer's book; you can find all this history in the area's historical records.

"Skill issue." How old are you? I think it would help you more if you contacted a shelter and talked about what they really do.

Better sources than Wikipedia that explain what they do; it is, of course, different from shelter to shelter, but euthanising due to overpopulation is still part of it. (Like too many books in a library, they need to make room for other books that people want, if it just end up roting on the shelf and nobody loans it over years, either destruction or storage, most don't have space for storage)

https://bestfriends.org/stories/best-friends-magazine/debate...

https://lifelineanimal.org/the-no-kill-controversy/