| 1 | 美国 | Water footprint;Greywater;Virtual water;Sustainability;Wastewater;Green water;Water scarcity;Water;Climate change;Food security;Water resources;Carbon footprint;Water reuse;Irrigation;China;Biofuels |
| 2 | 中国 | Water footprint;China;Virtual water;Input-output analysis;Water resources;Green water;Water scarcity;Blue water;Beijing;Greywater;Virtual water trade;Virtual water flow |
| 3 | 荷兰 | Water footprint;Virtual water;Greywater;Water scarcity;Sustainability;Virtual water trade;Black water;Green water;Blue water;Climate change;Water consumption;Water management |
| 4 | 英国 | Greywater;Water footprint;Virtual water;Sustainability;Water scarcity;Green water;Input-output analysis;Climate change;Recycling;Water supply;Groundwater;Life cycle assessment;Water resources |
| 5 | 澳大利亚 | Greywater;Water footprint;Virtual water;Sustainability;Life cycle assessment;Wastewater;Water use;Water scarcity;Irrigation;Water;Agriculture;Treatment;Water quality;Embodied water |
| 6 | 德国 | Greywater;Water footprint;Virtual water;Water scarcity;Green water;Blue water;Ecological sanitation;Agriculture;International trade;Water management;Anaerobic digestion |
| 7 | 意大利 | Water footprint;Virtual water;Water;Greywater;Sustainability;Diet;Life cycle assessment;Green water;Water scarcity;Blue water;Climate change;Green and blue water;Carbon footprint;Footprint;EU |
| 8 | 西班牙 | Water footprint;Virtual water;Greywater;Blue water;Green water;Irrigation;Industrial ecology;Life cycle assessment;Sustainability;Water scarcity;Virtual water trade;Water reuse;Input-output;Wastewater;Spain |
| 9 | 日本 | Water footprint;Greywater;Green water;Virtual water;Sustainability;Virtual water trade;Trade policy;Water scarcity;Water reuse;Input-output analysis;Water resources;Membrane bioreactor;Adaptation;Water-energy nexus;Impact pressure;Moving particle semi-implicit method;Shipping water |
| 10 | 瑞士 | Water footprint;Water scarcity;Virtual water;Life cycle assessment;Input-output analysis;Water resources;SWAT;SUFI-2 |