Cats are naturally curious and love to explore, so it's not uncommon for them to be drawn to the allure of a Christmas tree. The best way to discourage your cat from climbing the tree is to provide them with alternative climbing options. For example, you can provide a cat tree or scratching post for them to play on instead. You can also try placing double-sided tape on the base of the tree to discourage your cat from climbing it. If all else fails, you can always secure the tree to the wall with rope or bungee cords to prevent it from tipping over.