In 1985, Töpfer became State Minister for the Environment and Health in the government of Minister-President
Bernhard Vogel of
Rhineland-Palatinate. In 1987, Töpfer became Federal Minister for the Environment, Nature Conservation and Nuclear Safety under
Chancellor Helmut Kohl. During his time in office, Germany established the
Federal Office for Radiation Protection as a response to the
Chernobyl disaster and the
Transnuklear scandal. From 1994 to 1998 he served as Federal Minister for Regional Planning, Civil Engineering and Urban Development. He was a member of the
Bundestag from 1990 to 1998 and a member of the Steering Committee of the
CDU from 1992 to 1998. In 1998, Töpfer was appointed Under Secretary General of the
United Nations, General Director of the United Nations office in
Nairobi and Executive Director of the
United Nations Environment Programme. Among the milestones of his eight-year tenure are a number of important environmental agreements, including the
Cartagena Protocol on Biosafety and the
Stockholm Convention on Persistent Organic Pollutants. Töpfer was also closely involved in behind-the-scenes negotiations in support of the
Kyoto Protocol on
climate change. In June 2006 he was succeeded in this office by
Achim Steiner. As director of UNEP, he had a key role in gauging and attempting to remedy the environmental costs of the
2004 Asian tsunami. == Later career ==