The Education Assembly for a Sustainable Europe (EASE) project trains teachers in teaching sustainable development by designing and evaluating pre-service and in-service teacher training courses (EASE courses). These courses equip primary school teachers and pre-service teachers with the knowledge and skills required to teach lessons addressing Education for European Sustainable Development. The EASE courses intend to support teachers to gain the necessary general science knowledge about climate change and biodiversity, teaching skills to foster students’ arguing and ability to take in different perspectives and collaboratively search for solutions. This e-book reports on examining opportunities to educate and empower teachers to implement education for sustainable development goals in the context of European Grean Deal (EGD) issues. Chapter 1 delves into the educational principles underpinning the group problem solving approach. Chapters 2 and 3 detail the development, implementation, evaluation, and improvement of courses focused on education for sustainable development goals in the context of EGD for pre-service and in-service teachers. The final chapter offers concluding insights into how teachers can be better equipped to deliver high-quality education about the EGD.