Guido Visconti is Professor Emeritus at Università dell'Aquila, Italy and a member of the National Academy of Lincei. He has held a Fulbright Fellowship (1968-69), University of Maryland (USA). NATO Fellowship, Dept of Meteorology, MIT, USA, (1976, 1977). NATO Senior Fellowship, NCAR, USA (1986 -1987). He has served as committee member of the Intergovernmental Panel for Climatic Change (IPCC) and Member of the International Ozone Commission (WMO). In his long career he was the Principal Investigator UARS Correlative Measurements Program (NASA) and Atmospheric Effects of Supersonic Airplane (AESA,NASA). He was the author of the book Fundamentals of Physics and Chemistry of the Atmosphere, Second Edition, Springer, 2016 and the 2018 book Problems, Philosphy and Politics of Climate Science. Paolo Ruggieri is Junior Assistant Professor at the Department of Physics and Astronomy of the University of Bologna where he teaches Climatology and Atmospheric Physics. Since 2020he is affiliate scientist in the Climate Simulation and Prediction division of the CMCC foundation in Bologna. He contributed to the EU-funded Blue-Action, EUCP, COACCH projects and to the JPI-Climate MEDSCOPE project.