CourseCourse QuestionQuestionDocumentDocument

IB Environmental Systems and Societies

Topic 1: Foundation

Topic 2: Ecology

2.1 Individuals, populations, communities, and ecosystems

2.2 Energy and biomass in ecosystems

2.3 Biogeochemical cycles

2.3.1—Biogeochemical cycles purpose

2.3.2—Cycle components

2.3.3—Carbon stores

2.3.4—Carbon flows

2.3.5—Carbon sequestration

2.3.6—Ecosystems as carbon stores/sinks/sources

2.3.7—Fossil fuels as carbon stores

2.3.8—Agriculture as carbon store/source/sink

2.3.9—Ocean carbon exchange

2.3.10—Ocean acidification

2.3.11—Alleviating carbon cycle impacts

2.4 Climate and biomes

2.5 Zonation, succession and change

Topic 3: Biodiversity and conservation

Topic 6: Atmosphere and climate change

Topic 7: Natural resources

Topic 8: Human populations and urban systems

IB/ESS/SL//Concept/Topic 2: Ecology/2.3 Biogeochemical cycles/2.3.4—Carbon flows

Topic 2: Ecology

Syllabus: First assessment 2026
Section: —
Level: SL

Exam analysis

Most tested topics

Individuals, populations, communities, and ecosystems
Energy and biomass in ecosystems
Biogeochemical cycles
Climate and biomes
Zonation, succession and change