Experiments and analyses carried out by more than 250 scientists from 20 German institutions clearly indicate that ocean acidification and warming, along with other environmental stressors, impair life in the ocean. A brochure summarises major outcomes of the project for policymakers and the public. Members of the project Biological Impacts of Ocean Acidification (BIOACID) will also be present at the United Nations climate change conference COP23 in Bonn.