Table 1 CEE input and output index.

From: Coupling coordination and spatial network characteristics of carbon emission efficiency and urban green innovation in the Yellow River Basin, China

Index systems

Primary index

Secondary index

Index description and unit

Input index

Labor

Total number of employees

Total employment at year end (10,000 people)

Capital

Investment in fixed assets of the population

Perpetual inventory method (100 million yuan)

Land

Urban built-up area

Square Km

Energy

Total electricity consumption

Electricity consumption in society (10,000 kWh)

Output index

Desirable

GDP

100 million yuan

Urban green area

Hectare

Undesirable

CO2 emission

Million tons