Hierarchical Classification System of the Knowledge Base
- 1.
Water Resources - 2.
Water Resources Use - 3.
Agriculture - 4.
Land Reclamation - 5.
Land Degradation and Desertification - 6.
Hydroecology - 7.
Climate Change - 8.
Water Governance and Management - 9.
Water Law and Policy - 10.
Economic and Financial Aspects - 11.
Water and Education - 12.
Water and Ethics - 13.
Decision Support System - 14.
Sustainable Development, Green Growth, and Security - 15.
Gender and Gender Policy - 16.
Energy
Energy
Energy
16.1. Traditional energy sources
16.1.1. Thermal power (oil, natural gas, coal)
16.1.2. Nuclear power
16.2. Renewable energy sources
16.2.1. Solar power
16.2.2. Wind power
16.2.3. Hydropower (see 2.1.2. Hydropower)
16.2.4. Geothermal power
16.2.5. Biopower
16.3. Energy efficiency and conservation
16.3.1. Energy efficient methods and technologies
16.4. Energy policy and regulation
16.5 Energy security (see 14.4.3. Energy security)