Systems
Trace stores, flows, feedback, resilience, thresholds, and change through explicit system models, then connect those mechanisms to evidence from the question.
IB Environmental Systems and Societies • SL
IB Environmental Systems and Societies SL
Use this IB Environmental Systems and Societies SL study guide to browse the syllabus topic structure, study materials, and practice resources.
Structured practice
IB Environmental Systems and Societies SL Question Bank
Jump straight into grouped unit practice without losing your place in the syllabus overview.
1 Foundations of ESS
1.1 Environmental Value Systems
1.2 Systems & Models
1.3 Energy & Equilibria
1.4 Sustainability
1.5 Humans & Pollution
2 Ecosystems & Ecology
2.1 Species & Populations
2.2 Communities & Ecosystems
2.3 Flows of Energy & Matter
2.4 Investigating Ecosystems
3 Biodiversity & Conservation
3.1 An Introduction to Biodiversity
3.2 Origins of Biodiversity
3.3 Threats to Biodiversity
4 Water & Aquatic Food Production Systems & Societies
4.1 Introduction to Water Systems
4.2 Access to Fresh Water
4.3 Water Pollution
5 Soil Systems & Terrestrial Food Production Systems & Societies
5.1 Introduction to Soil Systems
5.2 Terrestrial Food Production Systems & Food Choices
5.3 Soil Degradation & Conservation
6 Atmospheric Systems & Societies
6.1 Introduction to the Atmosphere
6.2 Stratospheric Ozone
6.3 Photochemical Smog
7 Climate Change & Energy Production
7.1 Energy Choices & Security
7.2 Climate Change: Causes & Impacts
7.3 Climate Change: Mitigation & Adaptation
8 Human Systems & Resource Use
8.1 Population Dynamics
8.2 Resource Use in Society
8.3 Energy & Equitable Resource Use
Overview
Course overview
How to study IB Environmental Systems and Societies SL
IB Environmental Systems and Societies SL (ESS SL) is an interdisciplinary course spanning the sciences and individuals and societies. The current course began teaching in August 2024, with first assessment in May 2026. Its seven syllabus topics are connected by three unifying concepts—perspectives, systems, and sustainability—so effective revision should link environmental evidence and system behaviour with human decisions, competing values, and consequences at different scales.
Perspectives
Compare how stakeholders, cultures, values, and power shape interpretations of an environmental issue and the strategies proposed in response.
Sustainability
Evaluate environmental responses against named ecological, social, and economic criteria rather than treating sustainability as an unsupported conclusion.
Assessment at a glance
For the current ESS SL course with first assessment in May 2026, external assessment accounts for 75% and the individual investigation accounts for 25%. Confirm your examination session and any school deadlines with your teacher.
| Component | Format | Weighting |
|---|---|---|
| Paper 1 | 1 hour; unseen case study with data analysis and evaluation | 25% |
| Paper 2 | 2 hours; short-answer and data-based questions plus one structured essay | 50% |
| Internal assessment | 10 hours; individual environmental investigation (maximum 3,000 words) | 25% |
Sources: IB ESS guide (first assessment 2026) and IB Environmental Systems and Societies curriculum update.
Revision plan
- 1.Map each syllabus topic through the three concepts of perspectives, systems, and sustainability.
- 2.Practise interpreting unfamiliar graphs, maps, field data, and case-study evidence before recalling memorised examples.
- 3.Build concise located examples that support analysis of causes, consequences, stakeholder tensions, and possible responses.
- 4.Alternate Paper 1 case-study practice with Paper 2 short answers, data questions, and timed structured essays.
Exam strategy
For Paper 1, read the resource booklet as evidence and make every conclusion traceable to the supplied case study. For Paper 2, follow the command term, integrate environmental and societal reasoning, and make evaluative criteria explicit. Reserve time to check whether your answer addresses scale, uncertainty, and competing perspectives.
Practise IB Environmental Systems and Societies SL questionsFrequently asked questions
What is IB Environmental Systems and Societies SL?
IB Environmental Systems and Societies SL (ESS SL) is an interdisciplinary Diploma Programme course that combines scientific study of environmental systems with social, cultural, economic, political, and ethical perspectives on sustainability.
Is IB Environmental Systems and Societies offered at both SL and HL?
Yes. The course introduced for first teaching in August 2024 and first assessment in May 2026 is offered at both standard level and higher level. Students should confirm the syllabus for their examination session with their school.
What are the three concepts that organize the current IB ESS course?
The current IB ESS course is organized around three unifying concepts: perspectives, systems, and sustainability. These concepts connect the seven syllabus topics and should be used when interpreting evidence and evaluating environmental responses.
How is IB ESS SL assessed from May 2026?
ESS SL external assessment is worth 75%: Paper 1 is a one-hour unseen case-study and data paper worth 25%, while Paper 2 is a two-hour short-answer, data-based, and structured-essay paper worth 50%. The individual investigation is worth the remaining 25%.
What is the IB ESS internal assessment?
The ESS internal assessment is an individual environmental investigation worth 25% at SL. The current course permits limited collaboration on methodology under specified conditions, but every student submits a unique individual report of no more than 3,000 words.