One way to keep cats from climbing the Christmas tree is to place double-sided tape on the lower branches, as cats tend to dislike the sticky texture. Additionally, placing a covered base or wrapping it in foil can also deter cats from climbing the tree. If you have a tall tree, securing it with rope or fishing line to a nearby wall or ceiling can also prevent cats from toppling it over. Finally, placing a few cat-safe decorations on the bottom of the tree can provide a distraction for the cats, encouraging them to play with the ornaments rather than climb the tree.