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Interpretation of variables.
| Variable | Meaning | Description |
|---|---|---|
| CE | CO2 emissions | Annual CO2 emissions, Mt |
| P | Population size | Year-end population |
| A | Economic development level | Per capita GDP, at constant 2015 purchasing power parity (PPP), USD |
| EI | Energy intensity | Total primary energy consumption/GDP, tce/105 |
| UR | Urbanization rate | Urban population/Total population, % |
| FS | Proportion of fossil energy consumption | Fossil energy consumption/Total primary energy consumption, % |
