The study presents some reflections upon the significance of school climate in teaching and education. The author focuses in particular on the relationship between school climate and aggressive behavior among pupils. Practical outcomes of the research concerning that issue and its implications include various initiatives to promote positive school atmosphere. The article discusses a SafeMeasures process described in detail in "Transforming School Climate and Learning. Beyond Bullying and Compliance" by B. Preble and R. Gordon, which is based on action research and aimed at the improvement of school climate.