1. Foundation1.1 Perspectives0/01.1.1 What shapes perspectives and arguments1.1.2 Values: effects and expression1.1.3 Investigating perspectives with surveys1.1.4 Worldviews and environmental value systems1.1.5 Technocentric, anthropocentric, ecocentric perspectives1.1.6 Changing perspectives and the environmental movement1.2 Systems0/01.2.1 Systems and holistic approaches1.2.2 Storages, flows, and system diagrams1.2.3 Transfers, transformations, and system types1.2.4 Earth as an integrated system1.2.5 Negative feedback and equilibrium1.2.6 Positive feedback and tipping points1.2.7 Models: uses, forms, and limits1.2.8 Emergent properties and resilience1.3 Sustainability0/01.3.1 Sustainability and system resilience1.3.2 Three pillars and sustainability models1.3.3 Environmental, social, and economic sustainability1.3.4 Sustainable development and Brundtland1.3.5 Indicators, footprints, and biocapacity1.3.6 Environmental justice and inequalities1.3.7 Scales of action and SDGs1.3.8 Frameworks: boundaries, doughnut, circular economy1. Foundation1.1 Perspectives0/01.1.1 What shapes perspectives and arguments1.1.2 Values: effects and expression1.1.3 Investigating perspectives with surveys1.1.4 Worldviews and environmental value systems1.1.5 Technocentric, anthropocentric, ecocentric perspectives1.1.6 Changing perspectives and the environmental movement1.2 Systems0/01.2.1 Systems and holistic approaches1.2.2 Storages, flows, and system diagrams1.2.3 Transfers, transformations, and system types1.2.4 Earth as an integrated system1.2.5 Negative feedback and equilibrium1.2.6 Positive feedback and tipping points1.2.7 Models: uses, forms, and limits1.2.8 Emergent properties and resilience1.3 Sustainability0/01.3.1 Sustainability and system resilience1.3.2 Three pillars and sustainability models1.3.3 Environmental, social, and economic sustainability1.3.4 Sustainable development and Brundtland1.3.5 Indicators, footprints, and biocapacity1.3.6 Environmental justice and inequalities1.3.7 Scales of action and SDGs1.3.8 Frameworks: boundaries, doughnut, circular economy2. Ecology2.1 Individuals, populations, communities, and ecosystems0/02.1.1 Ecological organization and habitats2.1.2 Species, classification, and identification2.1.3 Populations: distribution and abiotic factors2.1.4 Ecological niches and interactions2.1.5 Carrying capacity, regulation, and growth patterns2.1.6 Humans and carrying capacity2.1.7 Estimating populations in the field2.1.8 Ecosystems, tipping points, and biosphere integrity2.2 Energy and productivity0/02.2.1 Photo- vs chemoautotrophs2.2.2 Primary productivity: definition and units2.2.3 Secondary productivity explained2.2.4 NPP as food-chain base2.2.5 Maximum sustainable yield (MSY)2.2.6 Eat lower trophic levels2.2.7 Ecological efficiency varies widely2.2.8 Second law: entropy in ecosystems2.3 Biogeochemical cycles0/02.3.1 Cycles, stores, sinks, and sources2.3.2 Carbon stores, residence time, and flows2.3.3 Sequestration, fossil fuels, ecosystem balance2.3.4 Oceans and acidification2.3.5 Managing the carbon cycle2.3.6 Nitrogen stores and key microbes2.3.7 Anaerobic soils, plant strategies, and flows2.3.8 Human nitrogen: Haber, boundary, solutions2.4 Climate and biomes0/02.4.1 Climate vs weather; climate shapes biomes2.4.2 Biome groups and characteristics2.4.3 Tricellular circulation and biome patterns2.4.4 Oceans redistribute absorbed heat2.4.5 Climate change shifts biome ranges2.4.6 Tropical cyclones and intensification2.5 Zonation, succession and change0/02.5.1 Zonation and measuring gradients2.5.2 Succession: temporal change and evidence2.5.3 Seral stages to climax2.5.4 Primary and secondary succession2.5.5 How succession alters ecosystems2.5.6 Resilience, diversity, and human activity2.5.7 Climax debates and alternative states2.5.8 Human influence and plagioclimax2. Ecology2.1 Individuals, populations, communities, and ecosystems0/02.1.1 Ecological organization and habitats2.1.2 Species, classification, and identification2.1.3 Populations: distribution and abiotic factors2.1.4 Ecological niches and interactions2.1.5 Carrying capacity, regulation, and growth patterns2.1.6 Humans and carrying capacity2.1.7 Estimating populations in the field2.1.8 Ecosystems, tipping points, and biosphere integrity2.2 Energy and productivity0/02.2.1 Photo- vs chemoautotrophs2.2.2 Primary productivity: definition and units2.2.3 Secondary productivity explained2.2.4 NPP as food-chain base2.2.5 Maximum sustainable yield (MSY)2.2.6 Eat lower trophic levels2.2.7 Ecological efficiency varies widely2.2.8 Second law: entropy in ecosystems2.3 Biogeochemical cycles0/02.3.1 Cycles, stores, sinks, and sources2.3.2 Carbon stores, residence time, and flows2.3.3 Sequestration, fossil fuels, ecosystem balance2.3.4 Oceans and acidification2.3.5 Managing the carbon cycle2.3.6 Nitrogen stores and key microbes2.3.7 Anaerobic soils, plant strategies, and flows2.3.8 Human nitrogen: Haber, boundary, solutions2.4 Climate and biomes0/02.4.1 Climate vs weather; climate shapes biomes2.4.2 Biome groups and characteristics2.4.3 Tricellular circulation and biome patterns2.4.4 Oceans redistribute absorbed heat2.4.5 Climate change shifts biome ranges2.4.6 Tropical cyclones and intensification2.5 Zonation, succession and change0/02.5.1 Zonation and measuring gradients2.5.2 Succession: temporal change and evidence2.5.3 Seral stages to climax2.5.4 Primary and secondary succession2.5.5 How succession alters ecosystems2.5.6 Resilience, diversity, and human activity2.5.7 Climax debates and alternative states2.5.8 Human influence and plagioclimax3. Biodiversity and conservation3.1 Biodiversity and evolution0/03.1.1 Biodiversity levels and resilience3.1.2 Evolution and natural selection fundamentals3.1.3 Speciation through isolation and adaptation3.1.4 Species diversity: richness, evenness, Simpson’s D3.1.5 Monitoring biodiversity for conservation3.1.6 Earth history and the fossil record3.1.7 Mass extinctions and the Anthropocene3.1.8 Human-driven selection and domestication3.2 Human impact on biodiversity0/03.2.1 Drivers of biodiversity loss3.2.2 Multiple impacts and interactions3.2.3 Invasive species: pathways and control3.2.4 IUCN Red List: status criteria3.2.5 From status to conservation priorities3.2.6 Case studies: extinct, endangered, recovered3.2.7 Tragedy of the commons3.3 Conservation and regeneration0/03.3.1 Values, perspectives, and justifications3.3.2 Conservation approaches: ex situ, in situ, mixed3.3.3 CBD treaty and Nagoya Protocol3.3.4 Habitat conservation and ecosanctuaries3.3.5 Reserve design, edges, and corridors3.3.6 Rewilding methods and examples3.3.7 Regeneration measures and evaluating success3.3.8 Ecotourism: benefits and risks3. Biodiversity and conservation3.1 Biodiversity and evolution0/03.1.1 Biodiversity levels and resilience3.1.2 Evolution and natural selection fundamentals3.1.3 Speciation through isolation and adaptation3.1.4 Species diversity: richness, evenness, Simpson’s D3.1.5 Monitoring biodiversity for conservation3.1.6 Earth history and the fossil record3.1.7 Mass extinctions and the Anthropocene3.1.8 Human-driven selection and domestication3.2 Human impact on biodiversity0/03.2.1 Drivers of biodiversity loss3.2.2 Multiple impacts and interactions3.2.3 Invasive species: pathways and control3.2.4 IUCN Red List: status criteria3.2.5 From status to conservation priorities3.2.6 Case studies: extinct, endangered, recovered3.2.7 Tragedy of the commons3.3 Conservation and regeneration0/03.3.1 Values, perspectives, and justifications3.3.2 Conservation approaches: ex situ, in situ, mixed3.3.3 CBD treaty and Nagoya Protocol3.3.4 Habitat conservation and ecosanctuaries3.3.5 Reserve design, edges, and corridors3.3.6 Rewilding methods and examples3.3.7 Regeneration measures and evaluating success3.3.8 Ecotourism: benefits and risks4. Water4.1 Water systems0/04.1.1 Energy and gravity drive water movement4.1.2 Hydrological cycle as system: stores and flows4.1.3 Major water stores and relative proportions4.1.4 Key flows and definitions4.1.5 Land use alters flows and flood risk4.1.6 Steady state and sustainable withdrawals4.2 Water access, use and security0/04.2.1 Water security: definition and importance4.2.2 Access determinants and water use sectors4.2.3 Expanding supply: storage and desalination4.2.4 Scarcity vs stress and thresholds4.2.5 Conservation: households, farms and industry4.2.6 Water footprints for planning4.2.7 Large-scale options and environmental impacts4.2.8 Drivers, conflicts, and equity4.3 Aquatic food production systems0/04.3.1 Primary producers in aquatic food webs4.3.2 Consumption and rising demand4.3.3 Unsustainable harvesting practices4.3.4 Consequences: fishery collapses4.3.5 Maximum sustainable yield (MSY)4.3.6 Climate change and acidification impacts4.3.7 Policy, MPAs, and consumer actions4.3.8 Aquaculture: growth and impacts4.4 Water pollution0/04.4.1 Water pollution sources and impacts4.4.2 Plastics and microplastics4.4.3 Measuring quality: abiotic tests, WQI, BOD4.4.4 Biological assessment: indicators and biotic indices4.4.5 Eutrophication: causes and sequence4.4.6 Eutrophication: services and management4.4.7 Sewage treatment stages and equity4.4.8 Governance and citizen action4. Water4.1 Water systems0/04.1.1 Energy and gravity drive water movement4.1.2 Hydrological cycle as system: stores and flows4.1.3 Major water stores and relative proportions4.1.4 Key flows and definitions4.1.5 Land use alters flows and flood risk4.1.6 Steady state and sustainable withdrawals4.2 Water access, use and security0/04.2.1 Water security: definition and importance4.2.2 Access determinants and water use sectors4.2.3 Expanding supply: storage and desalination4.2.4 Scarcity vs stress and thresholds4.2.5 Conservation: households, farms and industry4.2.6 Water footprints for planning4.2.7 Large-scale options and environmental impacts4.2.8 Drivers, conflicts, and equity4.3 Aquatic food production systems0/04.3.1 Primary producers in aquatic food webs4.3.2 Consumption and rising demand4.3.3 Unsustainable harvesting practices4.3.4 Consequences: fishery collapses4.3.5 Maximum sustainable yield (MSY)4.3.6 Climate change and acidification impacts4.3.7 Policy, MPAs, and consumer actions4.3.8 Aquaculture: growth and impacts4.4 Water pollution0/04.4.1 Water pollution sources and impacts4.4.2 Plastics and microplastics4.4.3 Measuring quality: abiotic tests, WQI, BOD4.4.4 Biological assessment: indicators and biotic indices4.4.5 Eutrophication: causes and sequence4.4.6 Eutrophication: services and management4.4.7 Sewage treatment stages and equity4.4.8 Governance and citizen action5. Soil and agriculture5.1 Soil0/05.1.1 Soils as dynamic systems5.1.2 Composition and soil biodiversity5.1.3 Profiles, horizons, and development5.1.4 Inputs, transfers, and transformations5.1.5 Outputs and degradation risks5.1.6 Soils supporting plant productivity5.1.7 Texture, humus, and fertility5.1.8 Soils in the carbon balance5.2 Agriculture and food0/05.2.1 Finite land and agro-climatic limits5.2.2 Agricultural systems and traditional practices5.2.3 Green Revolution and fertility inputs5.2.4 Building soil fertility and conserving soils5.2.5 Diets, trophic levels, and sustainability5.2.6 Strategies and technologies for sustainable supply5.2.7 Food availability, waste, and distribution5.2.8 Wild harvesting and sustainability debates5. Soil and agriculture5.1 Soil0/05.1.1 Soils as dynamic systems5.1.2 Composition and soil biodiversity5.1.3 Profiles, horizons, and development5.1.4 Inputs, transfers, and transformations5.1.5 Outputs and degradation risks5.1.6 Soils supporting plant productivity5.1.7 Texture, humus, and fertility5.1.8 Soils in the carbon balance5.2 Agriculture and food0/05.2.1 Finite land and agro-climatic limits5.2.2 Agricultural systems and traditional practices5.2.3 Green Revolution and fertility inputs5.2.4 Building soil fertility and conserving soils5.2.5 Diets, trophic levels, and sustainability5.2.6 Strategies and technologies for sustainable supply5.2.7 Food availability, waste, and distribution5.2.8 Wild harvesting and sustainability debates6. Atmosphere and climate change6.1 Introduction to the atmosphere0/06.1.1 Atmosphere supports life and redistributes gases6.1.2 Tricellular circulation redistributes heat6.1.3 GHGs, aerosols, and radiative forcing6.1.4 Natural vs enhanced greenhouse effect6.2 Climate change—causes and impacts0/06.2.1 Climate basics and rising emissions6.2.2 Proxies link CO₂ and temperature6.2.3 Enhanced greenhouse effect and GHGs6.2.4 Ecosystem impacts and resilience6.2.5 Societal impacts and resilience6.2.6 Feedbacks and energy-balance models6.2.7 Climate boundary likely exceeded6.2.8 Perspectives shape responses6.3 Climate change—mitigation and adaptation0/06.3.1 Global cooperation and governance6.3.2 Decarbonization and neutrality targets6.3.3 Mitigation strategies: reduce, reduce GHGs, remove CO₂6.3.4 Adaptation: structural and non-structural6.3.5 IPCC scenarios and climate modeling6.3.6 Technologies for mitigation6.3.7 Barriers and climate justice6.3.8 Geoengineering and the commons dilemma6.4 Stratospheric ozone0/06.4.1 Solar spectrum and UV energy6.4.2 Ozone shields life from UV6.4.3 UV harms ecosystems and health6.4.4 Ozone steady-state equilibrium6.4.5 ODSs accelerate ozone destruction6.4.6 Effects and polar ozone holes6.4.7 Montreal Protocol success6.4.8 Boundary avoided through action6. Atmosphere and climate change6.1 Introduction to the atmosphere0/06.1.1 Atmosphere supports life and redistributes gases6.1.2 Tricellular circulation redistributes heat6.1.3 GHGs, aerosols, and radiative forcing6.1.4 Natural vs enhanced greenhouse effect6.2 Climate change—causes and impacts0/06.2.1 Climate basics and rising emissions6.2.2 Proxies link CO₂ and temperature6.2.3 Enhanced greenhouse effect and GHGs6.2.4 Ecosystem impacts and resilience6.2.5 Societal impacts and resilience6.2.6 Feedbacks and energy-balance models6.2.7 Climate boundary likely exceeded6.2.8 Perspectives shape responses6.3 Climate change—mitigation and adaptation0/06.3.1 Global cooperation and governance6.3.2 Decarbonization and neutrality targets6.3.3 Mitigation strategies: reduce, reduce GHGs, remove CO₂6.3.4 Adaptation: structural and non-structural6.3.5 IPCC scenarios and climate modeling6.3.6 Technologies for mitigation6.3.7 Barriers and climate justice6.3.8 Geoengineering and the commons dilemma6.4 Stratospheric ozone0/06.4.1 Solar spectrum and UV energy6.4.2 Ozone shields life from UV6.4.3 UV harms ecosystems and health6.4.4 Ozone steady-state equilibrium6.4.5 ODSs accelerate ozone destruction6.4.6 Effects and polar ozone holes6.4.7 Montreal Protocol success6.4.8 Boundary avoided through action7. Natural resources7.1 Natural resources—uses and management0/07.1.1 Resources, natural capital, and income7.1.2 Ecosystem services sustain societies7.1.3 Renewable vs non-renewable use7.1.4 Valuing nature and changing values7.1.5 Managing for sustainability7.1.6 Resource security and choices7.1.7 Unsustainable methods and short-termism7.1.8 Globalization, insecurity, and improving security7.2 Energy sources—uses and management0/07.2.1 Energy sources and conversions7.2.2 Rising demand and finite fossils7.2.3 Sustainability and life-cycle impacts7.2.4 National energy choices7.2.5 Storage for intermittent renewables7.2.6 Conservation and efficiency7.2.7 Nuclear power: trade-offs7.2.8 Battery minerals and geopolitics7.3 Solid waste0/07.3.1 Waste sources, types, and household contents7.3.2 Changing volumes and injustice7.3.3 Pollution, biodegradability, and half-lives7.3.4 Prevention over restoration7.3.5 Disposal options: pros and cons7.3.6 Promoting sustainable SDW management7.3.7 Circular economy principles7. Natural resources7.1 Natural resources—uses and management0/07.1.1 Resources, natural capital, and income7.1.2 Ecosystem services sustain societies7.1.3 Renewable vs non-renewable use7.1.4 Valuing nature and changing values7.1.5 Managing for sustainability7.1.6 Resource security and choices7.1.7 Unsustainable methods and short-termism7.1.8 Globalization, insecurity, and improving security7.2 Energy sources—uses and management0/07.2.1 Energy sources and conversions7.2.2 Rising demand and finite fossils7.2.3 Sustainability and life-cycle impacts7.2.4 National energy choices7.2.5 Storage for intermittent renewables7.2.6 Conservation and efficiency7.2.7 Nuclear power: trade-offs7.2.8 Battery minerals and geopolitics7.3 Solid waste0/07.3.1 Waste sources, types, and household contents7.3.2 Changing volumes and injustice7.3.3 Pollution, biodegradability, and half-lives7.3.4 Prevention over restoration7.3.5 Disposal options: pros and cons7.3.6 Promoting sustainable SDW management7.3.7 Circular economy principles8. Human populations & urban systems8.1 Human populations0/08.1.1 Population inputs and outputs8.1.2 Population metrics and calculations8.1.3 Global growth and projections8.1.4 Direct population policies8.1.5 Indirect development policies8.1.6 Age–sex pyramids8.1.7 Demographic transition model8.2 Urban systems and urban planning0/08.2.1 Urban ecosystems as interconnected systems8.2.2 Defining urban and rural areas8.2.3 Urbanization and rural–urban migration8.2.4 Suburbanization and urban sprawl8.2.5 Environmental impacts of expansion8.2.6 Urban planning and sustainability8.2.7 Ecological and circular urban planning8.3 Urban air pollution0/08.3.1 Urban air pollutants overview8.3.2 Primary pollutant sources8.3.3 Fossil fuel combustion dominance8.3.4 Strategies to reduce air pollution8.3.5 Acid rain formation8.3.6 Acid rain impacts8.3.7 Managing NOx and SO2 impacts8. Human populations & urban systems8.1 Human populations0/08.1.1 Population inputs and outputs8.1.2 Population metrics and calculations8.1.3 Global growth and projections8.1.4 Direct population policies8.1.5 Indirect development policies8.1.6 Age–sex pyramids8.1.7 Demographic transition model8.2 Urban systems and urban planning0/08.2.1 Urban ecosystems as interconnected systems8.2.2 Defining urban and rural areas8.2.3 Urbanization and rural–urban migration8.2.4 Suburbanization and urban sprawl8.2.5 Environmental impacts of expansion8.2.6 Urban planning and sustainability8.2.7 Ecological and circular urban planning8.3 Urban air pollution0/08.3.1 Urban air pollutants overview8.3.2 Primary pollutant sources8.3.3 Fossil fuel combustion dominance8.3.4 Strategies to reduce air pollution8.3.5 Acid rain formation8.3.6 Acid rain impacts8.3.7 Managing NOx and SO2 impacts