UN Secretary-General António Guterres on Monday called for increased action to deliver $500 billion a year in affordable, long-term financing to developing countries at the eighth World Investment Forum held in Abu Dhabi.UN Secretary-General António Guterres on Monday called for increased action to deliver $500 billion a year in affordable, long-term financing to developing countries at the eighth World Investment Forum held in Abu Dhabi. Read MoreUN News – Global perspective Human stories