In this book, we tell 12 impact stories from citizen science efforts implemented across Europe. They serve as examples of how citizen science can create change with and for our society with the aim of achieving a more inclusive and sustainable future. Citizen science is creating impact with and for the people, going far beyond what can be captured by numbers and statistics. While impact is often measured in figures, these only tell part of the story. The true effects and changes brought about by citizen engagement in scientific endeavours are diverse, profound, and often intangible, extending into areas that numbers alone cannot fully convey. To truly understand the depth and breadth of these impacts, we must turn to the power of storytelling. Storytelling conveys the richness of data in a way that resonates on a personal level, providing anecdotal evidence and insights into the experiences of those involved. Through stories, we can explore the nuanced ways in which citizen science contributes to change—how it empowers individuals, fosters community, and sparks innovation. Stories give voice to the people behind the numbers, honouring the richness of their experiences and making the impact of citizen science relatable and tangible. The 12 impact stories presented in this book exemplify how citizen science is contributing to a more inclusive and sustainable future in Europe. Each story highlights the diverse ways in which citizens engage with science, from local environmental monitoring projects and ad-hoc activities in public libraries to strategic endeavours to establish citizen science at national scale and beyond. These stories showcase the power of collective action, where everyday people come together with scientists to create meaningful change. By telling these stories, we aim to go beyond the numbers and show the real-world impact of citizen science. We hope these narratives will offer you a glimpse into the potential of citizen science to transform not just the way we do science, but the way we live and work together as a society. As you journey through them, you will see how citizen science is more than just a method of data collection—it is a movement that fosters inclusion, drives sustainable development, and empowers communities across Europe. These stories are a testament to the incredible potential that lies in the hands of everyday citizens when they are given the tools and opportunities to engage with science. Welcome to a new perspective on citizen science, where the impact is measured not just in numbers, but in stories that bring those numbers to life. Preferred citation:Schuerz, S., Schaefer, T., Kieslinger, B. (2024). The impact of citizen science: 12 stories from across Europe. Zenodo. DOI: 10.5281/zenodo.13644655 Version 2 of the document has been adapted for better print readability and has amended some minor mistakes.