HanzAndHisFlammenwerfer

No problem

Short info https://www.bbr-server.de/bauarchivddr/archiv/dokumente/3-4-17-wohnungsbauserie-wbs70.pdf

The blueprints https://bauarchivddr.bbr-server.de/bauarchivddr/archiv/dokumente/3-4-01-2-wohnungsbauserie-wbs-70-6-3-t.pdf

This is the blueprints of a pre modern apartment building (its in German but you could use chat pdf if you need translation) more modern buildings use these as basis (modified versions of course) as these block buildings are modular, cheap, very resistant and reliable. They can definitely support the extra weight of some plants on the facade, nobody wants to plant trees on the building, that wouldn't necessarily be a weight problem but rather a problem with the roots damaging the building, and you can't really stop tree roots, maybe some smaller trees but definitely not Oaks or Fruit trees.

https://en.m.wikipedia.org/wiki/Hedera_helix

Its this one in the picture

As said, you don't need to use trees or gigantic plants, use Twiners and shrubs, they cover the whole facade and don't way that much, yet they do the same, if not a better job at keeping the building cool and the air cleaner. They don't need much maintenance and they don't grow indefinitely, if the plant cant reach more facade it stops, only thing is you have to regularly cut the plants around the windows, wich isn't a gigantic problem.

Depends on the plants...

Also... Humans are mostly water as well if you go by that. I know my balcony supports 3,2 (+ the required tolerance) metric Tons of weight on a area of 10 square meters.

I could plant a tree there. Probably more than one. And these building concepts are rather about small plants, so the weight shouldn't be a problem if you build with Reinforced Concrete like a normal person.

Idk the English word for it, but there is a kind of foil that is water resistant and where roots cant go through, as long as its not a tree or something at least. Its put between the foundation and the walls to stop water from below.

Pond liner is just what the translator got out, its probably incorrect.

Also im talking about this

Not planting literal trees on balconys, that would be a structural problem, yes. But small shrubs and Twiners would do the trick as well if not better in regards of cooling and weight. They also don't need much soil or and significantly less water.

Also can you stop spamming emojis?

If you don't build with cardboard this problem is very easy to solve, its called putting a goddam Pond liner between the dirt and the structure itself.

And the weigh isn't a issue with low buildings, say 10 to 20 floor that aren't made from cardboard, and higher than that is inefficient in all regards anyway and should be avoided.

This significantly oversees the fact that plants help in cooling the building down and to increase air quality.

Shure its not "The solution" but there is no singular solution to our problems, it can help. And as long as we don't build to high (wich is super inefficient) it should be a perfectly good part of the solution, and one that does not cost much.