4.1
Water systems
Hydrological cycle, Water stores and flows, Ocean carbon, Stratification, Upwelling, Thermohaline circulation
4.2
Water access, use and security
Water security, Equity, Scarcity and stress, Conservation, Governance, Water footprints
4.3
Aquatic food production systems
Aquatic food webs, Seafood demand, Overexploitation, MSY, Aquaculture, Fisheries governance
4.4
Water pollution
Pollution sources, Plastic debris, Water-quality monitoring, BOD, Eutrophication, Sewage treatment, Indicator species
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