| Variable | Index | Symbol | Unit |
|---|---|---|---|
| Explained variable | Energy consumption carbon footprint | EnerFP | hm2/person |
| Explaining variable | Level of science popularization resources development | PCR | |
| Control variable | Per capital GDP | PerGDP | Yuan/person |
| Energy consumption per 10,000 yuan of added industrial value | IndEC | Tons of standard coal/ten thousand yuan | |
| Population density | PopD | Person/square km |