Table 2.

Explanation of each explanatory variable and its descriptive statistical analysis.

Variable	Code	Unit	Observations	Mean	SD	Max	Min
The proportion of secondary industry	SIR	%	252	0.3783	0.1330	0.7370	0.0260
The proportion of tertiary industry	TIR	%	252	0.5895	0.1510	0.9549	0.2034
Energy consumption intensity	TECG	tce/104 yuan	252	0.0928	0.0458	0.2415	0.0201
Land use intensity	EUII	km2/109 yuan	252	13.6566	9.3966	56.6672	1.4791
Water resource utilization intensity	PCWC	m3/104 yuan	252	0.6945	0.2649	1.9689	0.1952
Foreign investment level	FDI	%	252	0.4056	0.2954	1.6150	0.0049
Education level	EDU	%	252	0.0644	0.0586	0.2414	0.0043
Research investment level	R&D	%	252	0.0099	0.0106	0.0504	0.0003
Government environmental regulation	ENVL	%	252	0.0077	0.0074	0.0334	0.0001

The value and quantity indicators in the table are all converted into constant prices in 2005.