Table 2 Variable definition and source.
From: An XGBoost-SHAP analysis of the driving factors of carbon emissions in China’s first-tier cities
Variables | Descriptions | Unit | Source |
|---|---|---|---|
CE | Total carbon emissions | Million tons | Emissions Database for Global Atmospheric Research |
PGDP | GDP per capita | CNY | China Urban Statistical Yearbook |
POP | Population size | 104 persons | China Urban Statistical Yearbook |
D | Urban form | – | China Urban Statistical Yearbook |
PT | Public transport | Vehicles per 104 persons | China Urban Statistical Yearbook |
IS | Industrial structure | % | China Urban Statistical Yearbook |
EI | Energy structure | tce/104CNY | Statistical Yearbook of China’s First-Tier Cities、China Energy Statistical Yearbook |
TI | Technological innovation | Ten thousand pieces | China Urban Statistical Yearbook |
DI | Level of new digital infrastructure | – | China Urban Statistical Yearbook |
