Rita Adrian is lead author in Working Group II (Impacts, Adaptation, Vulnerability) on the IPCC Sixth Assessment Report, released today. She contributed to the chapter on "Terrestrial and Freshwater Ecosystems and their Services." She is a professor of limnology at Freie Universität Berlin and headed the Department of Ecosystem Research at the Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB) until the end of 2021. She investigates the long-term development of lakes and studies the influence of environmental change on water bodies. Her motto for this interview: Let the numbers speak! So, on the occasion of the Sixth IPCC Report, six numbers that exemplify the current and projected impacts of climate change on freshwater ecosystems. We'll take on the 3, the 4, the 18, the 10, the 20, and the 60.