Participants: Antonio Ballarin Denti, Professor of Physics of the Environment at the Università Cattolica Sacro Cuore, Brescia; Richard Lindzen, Professor of Meteorology at the MIT, Boston; Franco Prodi, Director of the Istitute of Sciences of the Atmosphere and Climate at the CNR in Bologna. Introduced by Elio Sindoni, Director of the Department of Sciences, the Environment and the Territory at the Università degli Studi, Milan Bicocca.