FILE - In this Dec. 10, 1984 file photo, Chairman of the board of Union Carbide Warren M. Anderson speaks in Danbury, Conn. On Dec. 3, 1984, a pesticide plant run by Union Carbide leaked about 40 tons of deadly methyl isocyanate gas into the air, killing an estimated 15,000 people and affecting at least 500,000 more. Anderson, who headed Union Carbide Corp. then, died Sept. 29, 2014 in Vero Beach, Fla. Union Carbide is now a wholly owned subsidiary of the Dow Chemical Co. (AP Photo/Ron Frehm, File)