THE 20-metre “ghost tree” of Maryknoll Convent School will be cut down, as it is beyond saving after botched drainage work, the school said.But at least 2,500 concerned students and alumni have joined a second Facebook campaign to save the Norfolk Island pine, which has been standing inside the school’s Kowloon Tong campus for more than half a century. The tree faced removal last July as it was leaning slightly, and was considered a threat to students and traffic. The school agreed to keep it after some 1,000 current and former students and netizens joined a Facebook campaign to save the tree.But now, school management said its main roots have been severely and irreparably damaged by the contractor after recent drainage renovation work. The tree would be prone to collapse...