sentences:  The Cabinet Lubbers III was replaced by the Cabinet Kok I following the cabinet formation of 1989 on 22 August 1994.Lubbers semi-retired from active politics and became active in the public sector and occupied numerous seats as a non-profit director on several boards of directors and supervisory boards (World Wide Fund for Nature, Earth Charter, Organisation for Applied Scientific Research, Club of Rome and the Institute of International Relations Clingendael) and served on several and councils on behalf of the government ( and the .Lubbers also served as a distinguished visiting professor of International relations and Globalization at the Tilburg University and the John F. Kennedy School of Government of the Harvard University in Cambridge, Massachusetts from February 1995 until December 2000.