I use the no tree solution - they haven't climbed one in years because I haven't had one! In my teeny-tiny apartment, I don't miss it; I just decorate more and even decorate the cats which they really appreciated (NOT!)
Before I came up with that "solution" Goldie toppled the trees every year. The year she broke 21 ornaments (old, family collection ornaments) in one day was the last year I had a tree. It's so much less stressful on me and the kitties.
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