Pat McCoy, Finance Director, New York Metropolitan Transportation Authority, on being a leader in selling municipal green bonds, and the capital needed to revamp the system. Sean McCarthy, CEO, and Bob Cochran, Chairman, Build America Mutual, on municipal market conditions, and the outlook for US infrastructure.  Brooke Sutherland, Bloomberg Opinion industrials columnist, on Caterpillar tumbling after flagging higher costs for materials.  John Authers, Senior Markets Editor for Bloomberg, on the China selloff and economic risks in Italy.