[Retracted] How to Evaluate the Efficiency of Green Economy and Its Regional Differences: Evidence from China

Table 1

Index system of green economic efficiency.

Destination layer	Criteria layer	Indicator name (unit)
The input variables	Capital input	Capital stock (100 million yuan)
	Labor input	Total number of employed persons (ten thousand)
	Energy input	Water supply (100 million cu·m)
		Electricity consumption (100 million kw·h)
		Land for construction (1000 hectares)
The output variable	Desirable output	GDP (100 million yuan)
	Undesirable output	Industrial wastewater discharge (ten thousand tons)
		General solid waste emissions (ten thousand tons)
		Industrial sulfur dioxide emissions (ten thousand tons)
The extraneous variable	Economic development	Natural logarithm of per capital GDP (ten thousand yuan)
	Self-dependent innovation	Proportion of technology and education expenditure in GDP (%)
	Environmental investment	Proportion of energy conservation and environmental protection expenditure in GDP (%)
	Industrial structure	Proportion of secondary industry in GDP (%)
	Open door to the outside world	Proportion of total imports and exports to GDP (%)