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

6.4.1—Solar radiation spectrum

6.4.2—UV radiation danger

6.4.3—Stratospheric ozone protection

6.4.4—UV radiation impacts

6.4.5—Ozone equilibrium

6.4.6—Ozone-depleting substances (ODSs)

6.4.7—Ozone depletion effects

6.4.8—Montreal Protocol

6.4.9—Montreal Protocol success

6.4.10 (HL)—ODS mechanisms

6.4.11 (HL)—Polar stratospheric ozone depletion

6.4.12 (HL)—HFCs

6.4.13 (HL)—Air conditioning issues

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

HL.a Environmental law

HL.b Environmental economics

HL.c Environmental ethics

IB ESS HL 6.4.10 (HL)—ODS mechanisms Question Bank

• Release halogens (chlorine, fluorine) into stratosphere

• Break down ozone

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