Abstract for: "Small changes can cause big problems over time": Insights from a Systems Thinking Intervention on Ecosystems with 4th graders

System Dynamics education in K-12 has become an important mission within the community of System Dynamicists. This paper presents a scriptorium for conducting a four-hour systems thinking intervention on ecosystems for 4th graders. We used a three step approach: A general introduction to stocks and flows using the bathtub game serves as the basis for discussing the ongoing dynamics of global warming. A second application to an ecosystem is the classic predator-prey relationship. For discussing the kidsí learnings we do not only present immediate feedback but also the feedback gathered three months after. Finally, we reflect on insights from this intervention.