This episode's headline: Colombia: Dealing with Disaster; Role for Dublin; Road to the Summit: Chemical Reaction; Summit Prospects. The guests include In Washington: JAY MORRIS, Agency for International Development; ROBERT TILLING, U.S. Geological Survey; In New York: MICHAEL NOONAN, Minister of Justice, Ireland; Rep. MARIO BIAGGI, Democrat, New York; In Wichita, Kansas: GEORGE NEAVOLL, Wichita Eagle-Beacon; In Dallas, Texas: MOLLY IVINS, Dallas Times-Herald; In Durham, New Hampshire: JOE McQUAID, Manchester Union Leader; Reports from NewsHour Correspondents: JAN FISHER (Independent News), in Colombia; JOHN SIMPSON (BBC), in London; JIM LEHRER, in Washington. Byline: In New York: ROBERT MacNEIL, ExecutiveEditor; CHARLAYNE HUNTER-GAULT, Correspondent; In Washington: JUDY WOODRUFF, Correspondent