Sophie Szopa is an atmospheric chemist at the Laboratoire des Sciences du Climat et de l’Environnement. She uses numerical models to study how chemistry intervenes in the modification of the composition of the atmosphere and how this affects climate and air quality. She carried out work on these various current environmental issues, before becoming interested in the role of this chemistry in the distant past of the Earth. She has been involved in the assessment of knowledge of the physical bases of climate change for the IPCC (AR6) and coordinated a chapter on short-lived chemical compounds acting on the climate. She participated in the drafting of the Summary for Policymakers of this report and its approval by governments. She is currently vice-president of the University Paris-Saclay, in charge of the sustainable development.