This Cos4Cloud Educational Scenario Guide was developed to support the creation of Educational Scenarios that are part of citizen science-based environmental education activities and interventions led by NKUA. This Guide was adapted from a template initially used as a resource for Greek Environmental Education teachers and school educational stakeholders as part of the co-design of educational scenarios in the context of the Cos4Cloud project. The supporting resources and outputs were originally developed and delivered by NKUA in Greek and this Guide has been adapted as part of the Cos4Cloud Toolbox & Evidence Hub. This is one of the educational resources that demonstrates materials and results from citizen science and environmental education content and activities for schools developed and delivered by NKUA in the Cos4Cloud project. These resources have been collated, adapted and shared by the Open University in collaboration with project partners for the Cos4Cloud Toolbox & Evidence Hub. Cos4Cloud Toolbox educational resources coordinators: Rachel Redford, Janice Ansine, OU. Cos4Cloud Toolbox educational resources designer: Harriett Cornish, OU Contact: cos4cloud-toolbox@open.ac.uk.