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IB ESS SL Study Guide & Review

Connect environmental systems, source evidence, compact case studies and contrasting perspectives, then build concise analysis and justified evaluation for the current IB ESS SL course.

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  1. 01Learn concepts
  2. 02Practise questions
  3. 03Review mistakes

Syllabus knowledge tree

Explore the IB ESS SL syllabus

The current IB ESS SL syllabus connects perspectives, systems and sustainability across Foundation and seven environmental Topics. Use the live eight-group map to navigate the course while keeping the three HL lenses outside required SL scope.

8
syllabus groups
27
mapped topics

Preview the course map

Explore the course units and topics. Sign in to open the full mastery workspace and see your progress.

Topic 1: Foundation
1.1 Perspectives
1.2 Systems
1.3 Sustainability
Topic 2: Ecology
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
Topic 3: Biodiversity and conservation
3.1 Biodiversity and evolution
3.2 Human impact on biodiversity
3.3 Conservation and regeneration
Topic 4: Water
4.1 Water systems
4.2 Water access, use and security
4.3 Aquatic food production systems
4.4 Water pollution
Topic 5: Land
5.1 Soil
5.2 Agriculture and food
Topic 6: Atmosphere and climate change
6.1 Introduction to the atmosphere
6.2 Climate change—causes and impacts
6.3 Climate change—mitigation and adaptation
6.4 Stratospheric ozone
Topic 7: Natural resources
7.1 Natural resources—uses and management
7.2 Energy sources—uses and management
7.3 Solid waste
Topic 8: Human populations and urban systems
8.1 Human populations
8.2 Urban systems and urban planning
8.3 Urban air pollution

How to study IB ESS SL

IB ESS SL is best revised as connected environmental reasoning, not eight isolated folders. Use the syllabus map to move from the issue to a systems diagram, identify stocks, flows, feedback and stakeholders, then apply perspectives and sustainability to the evidence. Keep each case-study record compact: place, scale, process, stakeholder, outcome and limitation. The goal is to adapt evidence to an unseen source or essay prompt, not reproduce a memorised narrative.

Use Concept to rebuild the system, Mastery to retrieve terminology and examples, and the Question Bank to practise source use, data interpretation and judgment. After marking, classify the first lost mark as knowledge, system connection, evidence selection, perspective, case-study transfer or evaluation; repair that category and retry one matched task.

Practise each ESS demand differently

Match the activity to systems reasoning, source analysis, case-study transfer or evaluation instead of rereading every environmental Topic identically.

Systems and ecological change

Foundation, ecology, biodiversity and conservation

Draw the system with stocks, flows and feedback before explaining change. Link one disturbance to consequences at different scales, then evaluate a management response through evidence and stakeholder perspectives.

Practise ecological systems

Resources, water and land

Water systems, food production, soils and natural resources

Trace resource inputs, use, waste and feedback across the named place. Compare management options using measurable outcomes, affected groups, trade-offs and one explicit limitation in the available evidence.

Practise resources

Climate and urban systems

Atmosphere, climate change, populations and cities

Separate trend description from causal explanation. Combine source data with a compact case study, then compare mitigation or adaptation choices across scale, feasibility, equity and long-term environmental sustainability.

Practise climate and society

Paper 1 sources and Paper 2 essays

Unseen case studies, calculations, short answers and structured judgment

Annotate command terms, source claims, units and limitations first. For an essay, choose the question with the strongest argument and evidence, then plan contrasting perspectives before reaching a qualified conclusion.

Open exam-style questions

Where to start

Begin from one known environmental issue or use mixed questions to reveal the first repeatable reasoning or evidence gap.

Choose your starting point

  1. I know the weak Topic

    Open its exact syllabus group and identify the system, evidence and perspectives required within SL scope.

    Browse the syllabus

  2. I do not know what is weak

    Attempt a short mixed set and begin with the first repeated content, source-use or evaluation error.

    Open mixed questions

Choose the right starting point

  1. Map the environmental system

    Define the issue, draw key stocks, flows and feedback, then identify affected stakeholders and scales.

    Review a Concept

  2. Retrieve usable evidence

    Recall one compact case study and connect its process, outcome and limitation to the current question.

    Check Mastery

  3. Apply, judge and repair

    Use source evidence, compare perspectives, reach a justified judgment and classify the first lost mark.

    Practise questions

IB ESS SL assessment format

External assessment contributes 75% and the individual investigation contributes 25%. SL preparation should separate unseen case-study analysis, concise data application and one selected structured essay.

Paper / componentQuestionsTime% of grade
Paper 135 marksCompulsory questions analysing and evaluating data in a previously unseen case study.How to prepare: Practise selective source reading, accurate comparison or calculation and concise links between supplied evidence and relevant ESS knowledge.1 hour25%
Paper 260 marksSection A has 40 marks of short-answer and data-based questions; Section B requires one structured essay from two choices for 20 marks.How to prepare: Choose the essay by argument and evidence readiness, then compare perspectives and reach a balanced, evidence-based judgment.2 hours50%
Individual investigation30 marksOne individual written investigation report of no more than 3,000 words, internally assessed and externally moderated.How to prepare: Develop a focused inquiry, appropriate method, transparent processing, evidence-based conclusion and evaluation tied to specific methodological limitations.10 recommended course hours25%

SourceInternational Baccalaureate Organization · Environmental systems and societies guideIB Environmental systems and societies · First assessment May 2026

IB ESS SL questions

Choose one Topic when the weakness is known; otherwise attempt a short mixed set. Map the environmental system, retrieve one compact case study, apply it to source evidence and classify the first lost mark before choosing the next review action.

Store each example as place, scale, process, stakeholder, outcome and limitation. Practise adapting that compact record to unfamiliar sources and different command terms; do not memorise one long narrative that only answers a single rehearsed question.

Annotate the unseen source for claims, units, trends, stakeholders and limitations. Use comparative values when describing data, connect the evidence to relevant ESS knowledge, and keep evaluation specific to the inference or method rather than giving generic limitations.

The IB describes ESS as an interdisciplinary course combining sciences with individuals and societies. Its practical work, systems thinking, environmental evidence and social perspectives are integrated, so effective revision must practise both scientific analysis and justified evaluation.