>>> It will kill trees
Er, how's that meant to happen then? Ivy is NOT parasitic, so it's hard to see how a bit of ivy climbing up a tree is going to do it any harm.
The Royal Horticultural Society states
"Ivy growing on trees is often thought to be a serious problem, endangering the health of even very large trees. However, its presence on the trunk is not damaging and where it grows into the crown this is usually only because the trees are already in decline or are diseased and slowly dying"
and
"On most trees that are in sound health and are not being grown for their attractive bark, ivy can be allowed to grow on the trunk without concern for the tree's health or vigour"
(See my link above)
The Woodland Trust concurs:
"Ivy has long been accused of strangling trees, but it doesn’t harm the tree at all, and even supports at least 50 species of wildlife"
https://www.woodlandtrust.org.uk/trees-woods-and-wildlife/plants/wild-flowers/ivy/