1. Access
   1. Availability
   2. Equity
   3. Security
   4. Poverty
      1. Millennium Development Goals
2. Conflict
   1. International
   2. Intranational
3. Power
   1. Hydro
   2. Desal
   3. Wave/Tidal
4. Capture
   1. Dams
   2. Environmental Impacts
5. Food
   1. Irrigation
      1. Salinity
   2. Famine
6. Quality
   1. Pollution
      1. Regeneration
   2. Disease
7. Climate
   1. Melt
   2. Disaster
      1. Drought
      2. Flood
8. Global Warming
   1. Sea levels
   2. Rivers
   3. Temperatures