Index layer

Investment in environmental pollution control as a percentage of GDP

Forest cover rate

Research and experimental development expenditure as a percentage of GDP

Research and experimental development expenditure growth rate

Investment in environmental pollution control as a percentage of GDP

1

2

1

2/3

Forest cover rate

1/2

1

1/2

1/3

Research and experimental development expenditure as a percentage of GDP

1

2

1

2/3

Research and experimental development expenditure growth rate

3/2

3

3/2

1

Weights R2ij

0.2875

0.1187

0.2375

0.3563