What are the prerequisites for taking IB ESS?

There are generally no strict subject prerequisites for IB ESS, making it accessible for students from various academic backgrounds. This interdisciplinary course blends environmental science and social studies, and coordination with your IB coordinator is recommended to ensure proper subject balance.

How difficult is IB ESS compared to other IB sciences?

ESS is considered different rather than simply easier or harder than other IB sciences. While it is less math-intensive than Physics or Chemistry, it requires strong essay writing, critical thinking, and the ability to integrate scientific knowledge with social and ethical issues. It focuses on systems thinking and real-world environmental challenges rather than detailed scientific specialization.

Can I take ESS alongside other science subjects?

Yes, ESS can be combined with other sciences and is quite feasible. ESS can count as either a Group 3 (Individuals and Societies) or Group 4 (Sciences) subject, allowing students to satisfy diploma requirements flexibly. Many students pair ESS with other sciences like Biology or Chemistry, especially if they plan to pursue environmental-related degrees.

How is IB ESS assessed and what is the exam structure?

ESS assessment consists of 75% external assessment (two exam papers with multiple choice, short answer, and essay questions - Paper 1 is a case study, Paper 2 involves data interpretation and extended responses) and 25% internal assessment (a practical research investigation on an environmental issue chosen by the student). The course spans about 150 teaching hours involving theoretical learning, practical investigations, and research.

What career opportunities does IB ESS prepare students for?

ESS is highly relevant for students interested in environmental careers such as environmental science, policy, conservation, sustainability, or resource management. It builds capabilities valued in further studies and professions related to global environmental challenges, policy making, and sustainable development. The course provides a foundation for degrees in environmental science and related fields.

What are the key topics covered in the IB ESS curriculum?

The ESS curriculum covers core thematic areas including: Foundations of ESS (environmental value systems, systems and models, energy concepts, sustainability, pollution), Ecology (ecosystem interactions, energy flow, population dynamics, biogeochemical cycles), Biodiversity and Conservation (species diversity, threats, conservation strategies), plus topics on water systems, soil systems, atmospheric systems, climate change, energy production, and human systems and resource use.

IB Environmental systems and societies Resources

International Baccalaureate (IB)First Exam: 2026

Browse IB Environmental systems and societies notes, questionbank questions, videos, flashcards, and revision tools for SL and HL.

IB Environmental Systems and Societies (ESS) is a Group 3 & 4 subject in the International Baccalaureate Diploma Programme (IBDP). It explores environmental systems, sustainability, biodiversity conservation, climate change, and human-environment interactions, with a strong focus on interdisciplinary analysis combining scientific methodologies with social science perspectives, practical fieldwork, and systems thinking.

The course is available at Standard Level (SL), 150 teaching hours and Higher Level (HL), 240 teaching hours, with first assessment in 2026.

Environmental systems and societies (ESS)

All Resources

Practice

Questionbank

Practice questions with AI feedback

1018 questions

Exam builder

Build your own mock exam

Predicted Papers

Prediction exams for practice

4 papers

Learn

Textbooks

Study guides with diagrams and examples

472 chapters

Lessons

Step-by-step lessons and quizzes

171 lessons

New

Flashcards

Remember concepts with active recall

232 flashcard decks

Cheatsheets

Summaries, key concepts, and exam tips

30 cheatsheets

Key Definitions

Essential terms and concepts explained

Coursework

IA/EE Exemplars

High-quality IA & EE examples

IA/EE Guide

Step-by-step coursework guidance

Grade your IA/EE

Get instant feedback on your IA or EE draft

Reference

Grade Boundaries

Official IB grade boundaries by exam session

Assessment at a Glance

Assessment	Format	SL	HL	Weighting
Paper 1	Data response and case study questions	1 hour	2 hours	25% (SL), 30% (HL)
Paper 2	Structured short-answer and extended essay questions	2 hours	2.5 hours	50% (SL), 50% (HL)
Internal Assessment	Individual investigation (up to 3,000 words)	25 hours	25 hours	25% (SL), 20% (HL)

All Topics

1.1 Perspectives

1.2 Systems

1.3 Sustainability

2.1 Individuals, populations, communities and ecosystems

2.2 Energy and biomass in ecosystems

2.3 Biogeochemical cycles

2.4 Climate and biomes

2.5 Zonation, succession and change in ecosystems

3.1 Biodiversity and evolution

3.2 Human impact on biodiversity

3.3 Conservation and regeneration

4.1 Water systems

4.2 Water access, use and security

4.3 Aquatic food production systems

4.4 Water pollution

5.1 Soil

5.2 Agriculture and food

6.1 Introduction to the atmosphere

6.2 Climate change - causes and impact

6.3 Climate change - mitigation and adaptation

6.4 Stratospheric ozone

7.1 Natural resources - uses and management

7.2 Energy sources - uses and management

7.3 Solid waste

8.1 Human populations

8.2 Urban systems and urban planning

8.3 Urban air pollution

HL.a Environmental law

HL.b Environmental economics

HL.c Environmental ethics

Course Aims & Skills

Develop understanding of their own environmental impact, in the broader context of the impact of humanity on the Earth and its biosphere

Develop knowledge of diverse perspectives to address issues of sustainability

Engage and evaluate the tensions around environmental issues using critical thinking

Frequently Asked Questions

Ready to start studying?

IB Environmental systems and societies Resources

International Baccalaureate (IB)First Exam: 2026

Browse IB Environmental systems and societies notes, questionbank questions, videos, flashcards, and revision tools for SL and HL.

The course is available at Standard Level (SL), 150 teaching hours and Higher Level (HL), 240 teaching hours, with first assessment in 2026.

Assessment at a Glance

Assessment	Format	SL	HL	Weighting
Paper 1	Data response and case study questions	1 hour	2 hours	25% (SL), 30% (HL)
Paper 2	Structured short-answer and extended essay questions	2 hours	2.5 hours	50% (SL), 50% (HL)
Internal Assessment	Individual investigation (up to 3,000 words)	25 hours	25 hours	25% (SL), 20% (HL)