1. Population
2. Access
   1. Availability
   2. Equity
   3. Security
   4. Poverty
      1. UN Millennium Development Goals
         1. End Poverty & Hunger
         2. Universal Education
         3. Gender Equality
         4. Child Health
         5. Maternal Health
         6. Combat HIV/Aids
         7. Environmental Sustainability
         8. Global partnership
3. Conflict
   1. International
   2. Intranational
4. Power
   1. Hydro
   2. Desal
   3. Wave/Tidal
5. Capture
   1. Dams
   2. Recycling
   3. Environmental Impacts
6. Food
   1. Irrigation
      1. Salinity
   2. Famine
7. Quality
   1. Pollution
      1. Regeneration
   2. Disease
8. Climate
   1. Melt
   2. Disaster
      1. Drought
      2. Flood
9. Global Warming
   1. Sea levels
   2. Rivers
   3. Temperatures