This Environmental Systems and Societies (ESS) course and teacher’s guide is specifically intended for teachers and students of the new transdisciplinary IB Environmental Systems and Societies SL course and replaces the previous Environmental Systems course. This course guide includes over 350 pages of teacher daily lesson plans that are sequentially linked and fully integrated with the IB Environmental Systems and Societies syllabus. An important new feature in this resource is the TOK Integration sections throughout the course. These sections give the teacher ideas on how to integrate TOK (Theory of Knowledge) into the course, a mandatory component of IB courses. The Student Activity Book includes interesting labs, hands-on class activities, practical research and active homework assignments that relate to and reinforce the syllabus topics. This will provide the ability for the teacher to create an effective PSOW (Practical Scheme of Work). Special attention is paid to the new and revised IB Internal Assessment marking criteria for the labs to ensure success in this important area.