IB Environmental Systems and Societies
Transdisciplinary study linking environmental science with societal values, systems, and sustainability.
IB Environmental Systems and Societies (ESS) is a transdisciplinary course that bridges Group 3 (Individuals and Societies) and Group 4 (Sciences). Students explore environmental systems, biodiversity, pollution, resource use, and climate change while evaluating the political, economic, and ethical dimensions of environmental issues using a systems-based approach. The current course was first assessed in 2026.
Why ESS Matters
Your grade in IB Environmental Systems and Societies counts toward the 45-point Diploma, and many university courses ask for a particular grade in the subject, often at Higher Level.
SL covers eight topics, from foundations and ecology to natural resources and human populations, across 150 teaching hours with a systems and value-based perspective.
HL adds content within the topics and three HL lenses, environmental law, environmental and ecological economics, and environmental ethics, across 240 teaching hours.
Career Pathways
ESS syllabus topics
The topics of the subject guide. Lessons follow your school's order and level.
- Perspectives
- Systems
- Sustainability
- Content common to SL and HL
- Additional HL content
- Content common to SL and HL
- Additional HL content
- Content common to SL and HL
- Additional HL content
- Content common to SL and HL
- Additional HL content
- Content common to SL and HL
- Additional HL content
- Content common to SL and HL
- Additional HL content
- Content common to SL and HL
- Additional HL content
- Environmental law
- Environmental and ecological economics
- Environmental ethics
How lessons approach ESS
Understanding the concepts, and answering the papers the way the markscheme rewards.
- Apply systems diagrams to environmental issues
- Connect scientific evidence to value systems
- Use case studies to anchor abstract concepts
- Balance environmental, social, and economic perspectives
- Practice Paper 1 case-study data analysis
- Structure extended responses with evaluation
- Use ESS command terms precisely
- Plan and document the Individual Investigation carefully
Past papers and markschemes
IB ESS past papers with markschemes and examiner reports, used in lessons alongside the questions from your own school.