APEX, North Carolina / DUBLIN, Ireland, Apr 23 (IPS) - What makes an effective UN Secretary-General? In our previous posts, we highlighted six possible candidates: Michelle Bachelet (Chile), Rebeca Grynspan (Costa Rica), Maria Fernanda Espinosa (Ecuador), Alicia Bárcena (Mexico), Mia Mottley (Barbados), and Amina J. Mohammed (Nigeria).