A vertical forest is growing in the middle of one of europe’s dirtiest cities, article.
The "forest" is on the outside of an apartment building, and it's almost done.
I'ts a bit risky, I think. It will take a lot of maintenance to stop the trees overgrowing their small boxes and turn the whold shebang into slum, cocooned in green monoliths (Duoliths?).
Sure, they are taking measure, but I've just seen a picture of a tree growing up through a boulder. Never underestimate the power of nature.