1Department of Economics and Management, North China Electric Power University,
Baoding, Hebei 071003, China
2The Academy of Baoding Low-Carbon Development, Baoding, Hebei 071003, China
Submission date: 2014-11-28
Final revision date: 2015-01-06
Acceptance date: 2015-04-21
Publication date: 2015-09-21
Pol. J. Environ. Stud. 2015;24(5):2261–2267