IMPETUS Accelerator Call and The European Union Prize for citizen science - 2025. What is IMPETUS? IMPETUS is a project funded by the European Commission to support and give recognition to citizen science in Europe. IMPETUS' goal is to: enable more diverse citizen science initiatives to access funding; bring citizen science closer to society and policy makers; acknowledge the role of citizen science in tackling the greatest challenges of our times; and enable citizen science initiatives to contribute to Green Deal and UN Sustainable Development Goal commitments. IMPETUS will do this by directly funding and supporting citizen science initiatives selected through open calls; awarding the European Union Prize for Citizen Science to outstanding projects; and developing resources that help citizen science initiatives become more impactful and sustainable. This open accelerator call is for funding and support for citizen science initiatives. IMPETUS is funded by the European Union’s Horizon Europe Research and Innovation Programme. IMPETUS takes an inclusive view on citizen science. We broadly follow the Green Paper on Citizen Science for Europe from January 2014, which defines it as the public participating “in scientific research activities, when citizens actively contribute to science either with their intellectual effort or surrounding...