A three-day workshop on 'Response Theory and Its Applications in Geophysical Fluid Dynamics', organised: V. Baladi, W. Bahsoun, S. Galatolo, V. Lucarini, will take place at the Institut Henri Poincar?, Paris from October 14-16, 2019. To register please follow the link: www.ihp.fr/en/CEB/T3-2019/Response_Theory This workshop is part of the IHP trimester (September 9-December 13) "The Mathematics of Climate and the Environment"