Walking round where we live so many trees smothered in ivy and sooner or later will be brought down in a high wind. These trees smothered in ivy look dark and sad and nutrients being taken to support the ivy. Not sure if this problem is just very bad here in the UK or if its everywhere.
But sometimes take small clippers and cut it through low down or pull off and in a few weeks the ivy dies and hope this prolongs the life of the tree.
Maybe next time you’re passing a tree, smothered in ivy.. you could do same thing.