“…An increasing number of firms are attempting to find methods for sustainable development to increase their profits and to protect the environment at the same time (Epicoco, Oltra, & Saint Jean, 2014;Yabar, Uwasu, & Hara, 2013). Therefore, environmental innovation, as a new pattern of development, has attracted much attention from both researchers and practitioners (Polzin, Von Flotow, & Klerkx, 2016). Unlike traditional innovation, environmental innovation involves the dual externalities of positive R&D spillover and environmental protection, and can enhance a firm's competitive advantage and improve its environmental performance (Faucheux & Nicolaı, 1998;Kesidou & Demirel, 2012;Porter & van der Linde, 1995).…”