Table 2.

Weighting table based on entropy value.

Variable	Weighting
1. Pre-emptive environmental behavior
Companies develop products that are good for the environment	0.091
Measures to reduce the three kinds of waste	0.057
Circular economy	0.142
Energy conservation	0.073
Green office	0.122
Environmental certification	0.142
Environmental recognition	0.177
Other behaviors	0.196
2. Ex-post environmental behavior
Environmental penalties imposed on corporations	0.671
Pollutant discharge behavior	0.329
3. Formal environmental regulation
（1）Market-incentive regulation
Sewage charges	0.111
（2）Command-control regulation
Number of employees in environmental agencies	0.191
Number of environmental laws and regulations, local regulations, and environmental standards promulgated in each region	0.218
Number of environmental penalty cases	0.211
（3）Voluntary-participation regulation
Number of environmental proposals from regional NPCs and CPPCCs	0.111
Number of denouncement of environmental problems	0.159
4. Informal environmental regulation
Population density	0.135
Income	0.315
Education	0.299
Age Structure	0.251