IB ESS - Environmental Systems and Societies
Your complete study hub for IB ESS. Free notes, flashcards, mock exams, and AI-powered practice for every topic.
What is IB ESS?
IB Environmental Systems and Societies (ESS) is an interdisciplinary subject that explores how human societies interact with the natural environment. It combines environmental science with an understanding of the political, economic, and social frameworks that shape environmental decisions.
ESS is unique in the IB Diploma because it can fulfil either a Group 3 or Group 4 requirement. From May 2026, ESS is available at both Standard Level and Higher Level, with HL students studying the same 8 topics in greater breadth and depth plus additional HL lenses.
Subject Group
Group 3 + 4
Available Levels
SL and HL
Teaching Hours
150 (SL) / 240 (HL)
Exam Papers
Paper 1 · Paper 2 · IA
IB ESS Assessment
Paper 1 - Case Study
25% (SL) / 30% (HL)1h (SL) / 2h (HL)Students analyse a previously unseen case study using provided data. All questions are compulsory.
Paper 2 - Short Answer and Essay
50% (SL and HL)2h (SL) / 2.5h (HL)Section A contains short-answer and data-based questions. Section B contains structured essay questions with limited choice.
Internal Assessment
25% (SL) / 20% (HL)An individual scientific investigation in which students gather and analyse data to answer their own research question.
IB ESS Syllabus - All Units and Topics
Unit 1: Foundations of ESS
Unit 2: Ecology
Unit 3: Biodiversity and Conservation
Unit 4: Water
Unit 5: Land
Unit 6: Atmosphere and Climate Change
Unit 7: Natural Resources
Unit 8: Human Population and Urban Systems
Free IB ESS Study Resources
Predicted Topics 2026
Data-driven exam predictions based on past papers
Study Notes
Topic-by-topic notes for every unit
Flashcards
Spaced-repetition flashcards
Mock Exams
Full papers with AI marking
Question Bank
Practice by topic and command term
Exam Skills
Paper strategies and mark schemes
Command Terms
IB command term definitions
Frequently Asked Questions about IB ESS
What is the difference between ESS SL and HL?
SL and HL share the same core topics and both sit Paper 1 and Paper 2. HL covers the same syllabus in greater depth with additional HL lenses, longer papers, and deeper analytical expectations.
Is IB ESS hard?
IB ESS is often considered one of the more accessible IB sciences. The main challenge is breadth across the syllabus, while HL adds more depth and evaluation.
How do I get a 7 in IB ESS?
Master all 8 units, practise past papers regularly, learn IB command terms, connect theory to real-world case studies, and aim for full marks on your IA through careful planning and analysis.
Can IB ESS count as a Group 3 subject?
Yes. ESS is the only transdisciplinary IB subject and can fulfil either a Group 3 or Group 4 requirement.
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