| Variable | Measurement | Era | SPSS code | N | Source |
| Existing biological capacity | Area units per capita, for human use. | 1996 | BioCapacity_96 | 93 | Living Planet Report 2000; table 2 |
| Bio diversity potential | Composite index of relative biodiversity potential for each country based on the species represented in each country, their threat status, and the diversity of the habitat type in each country. The index is normalized. Values run from 0 (no biodiversity potential) to 100 (maximum biodiversity potential | 2005 | BioDiversity_05 | 128 | World Development Indicators 2007, table 3.4 |
| Variable | Measurement | Era | SPSS code | N | Source |
| Ecological footprint | Biologically productive space required to produce the food and wood people consume and to absorb the CO2 omitted from burning fossile fuels. Expressed in hectares per capita. |
1996 | EcologicalFootprint_96 | 93 | Living Planet Report 2000, table 2 |
| Variable | Measurement | Era | SPSS code | N | Source |
| Environmental performance Index (EPI) | Index of: |
2006 | EPI_2006 | 132 | EPI website |
| Related variables: |
Related topics: |
Related themes: Consumption Geography |
States of Nations is an inventory of country characteristics. It is part of the World Database of Happiness
Added keywords: Cross-national, Environmental protection, Sustainability,