Christos Zerefos, Head, Research Center for Atmospheric Physics and Climatology, Academy of Athens. Professor of Atmospheric and Environmental Physics at the Universities of Athens and Thessaloniki. Visiting Professor at the Universities of Boston, Minnesota, Oslo. Has published numerous scientific papers in the fields of atmospheric physics and climatology and has received a number of internationally recognized awards among which Honorary Professor, University of Thessaloniki; Medal of Honor, Balkan Physical Union; f. President and Honorary Member, International Ozone Commission; Honorary Doctorate Degree, University of Patras; the Yoram Kaufman Award and Editors Award for Excellence in Refereeing, American Geophysical Union; French Government Decoration “Commandeur dans l’ordre de Palmes académiques”; Blaise Pascal Medal, European Academy of Sciences; Gold Medal of the City of Thessaloniki; Medal of the City of Athens; Award Certificate and Letter from UNEP and from IPCC for his substantial contribution to the reports of IPCC, which shared the 2007 Nobel Peace Prize with the former Vice President of USA, Al Gore, Fellow, Institute of Physics, UNEP Honorable Mentions, American Geophysical Union, Global Ozone Award, UNEP on the 10 th Anniversary of the Montreal Protocol. In the past 20 years has acted as author, contributor or reviewer in almost all WMO/UNEP Scientific Assessments of Ozone Depletion. Member Academy of Athens, the Norwegian Academy, Academia Europaea, the Russian Academy of Natural Sciences etc. Coordinator of the Climate Change Impacts Study Committee of the Bank of Greece and international expert on planetary changes.