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

2.4 Climate and biomes

2.4.1—Climate vs. weather

2.4.2—Biome definition

2.4.3—Biome distribution determinants

2.4.4—Biome categories

2.4.5—Tricellular model

2.4.6—Ocean heat distribution

2.4.7—Global warming effects

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/2.4 Climate and biomes/2.4.7—Global warming effects

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