8
Topics
IB Group 4 — Sciences
IB Environmental Systems & Societies 2026
ESS is an interdisciplinary SL subject combining natural and social sciences. It covers ecosystems, biodiversity, climate change, pollution, conservation, and the social/political dimensions of environmental issues.
SL · 150h
SL
Levels
20%
IA Weight
150h
HL Hours
Syllabus Topics
Official topic breakdown with approximate teaching hours.
| Topic | SL Hours |
|---|---|
| Foundations of Environmental Systems and Societies | 8h |
| Ecosystems and Ecology | 25h |
| Biodiversity and Conservation | 18h |
| Water and Aquatic Food Production Systems | 12h |
| Soil Systems and Terrestrial Food Production | 12h |
| Atmospheric Systems and Societies | 20h |
| Climate Change and Energy Production | 15h |
| Human Systems and Resource Use | 15h |
| Total | 150h |
Assessment Structure
External Assessment
Paper 1 (2.25 hrs, case study with structured questions, 45%). Paper 2 (1.75 hrs, short answer and extended response, 35%). Internal Assessment: Individual Investigation (20%).
Internal Assessment — Individual Investigation
SL: 20%
A student-designed environmental investigation assessed on personal engagement, exploration, analysis, evaluation, and communication.
Exam Tips for IB Environmental Systems & Societies
1
Apply EVS (Environmental Value Systems) language in every essay — identify your stakeholder's perspective
2
Learn S-curves (logistic growth) and J-curves (exponential growth) and when each applies
3
Paper 1 is an unseen case study — read it carefully and anchor all answers to the data provided
4
Revise real-world examples for every topic (specific reserves, agreements, species, statistics)
5
ESS can count as Group 3 or Group 4 — check with your school which slot it fills
Predict your IB Environmental Systems & Societies grade
Enter your component marks and see your predicted final grade based on grade boundaries.
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Frequently Asked Questions
What topics are in IB Environmental Systems & Societies?
IB Environmental Systems & Societies covers Foundations of Environmental Systems and Societies, Ecosystems and Ecology, Biodiversity and Conservation, Water and Aquatic Food Production Systems, Soil Systems and Terrestrial Food Production, Atmospheric Systems and Societies, Climate Change and Energy Production, Human Systems and Resource Use. Total teaching hours: 150.
How is IB Environmental Systems & Societies assessed?
Paper 1 (2.25 hrs, case study with structured questions, 45%). Paper 2 (1.75 hrs, short answer and extended response, 35%). Internal Assessment: Individual Investigation (20%). The Internal Assessment (Individual Investigation) counts for 20% of the final grade at SL.
What is the IB Environmental Systems & Societies IA?
The IB Environmental Systems & Societies IA is the Individual Investigation. A student-designed environmental investigation assessed on personal engagement, exploration, analysis, evaluation, and communication. It accounts for 20% of the final grade at SL.
Should I take IB Environmental Systems & Societies HL or SL?
Take HL if Environmental Systems & Societies is relevant to your university course (Students wanting a science credit with a humanities or sustainability focus.), or if you are genuinely strong in the subject. HL adds -150 extra hours of content and deeper examination requirements. SL is suitable if you need the subject for the diploma but it is not your primary focus.