So far, I hadn't seen written what's most obvious problem to me. A dead branch or something from the tree that falls from a building will kill or cause serious

So far, I hadn't seen written what's most obvious problem to me. A dead branch or something from the tree that falls from a building will kill or cause serious injury to someone. Now if a few trees were dead center on the roof, they likely wouldn't, but anything close to overhanging in high winds will shake loose objects very dangerous to humans. sure you could protect people by adding nets. Well then you have a skyscraper that looks trashier than it did without plants at all.