Table 3.

Variable definitions and measurement.

Variable type	Variable name	Variable symbol	Variable definition
Explained variable	Green technology innovation	gti	ln (Number of green patent applications+1)
Core independent variable	Corporate social responsibility	csr	ln (Social responsibility rating scores of listed companies on Hexun)
	Internal corporate social responsibility	incsr	ln (Internal social responsibility rating scores of listed companies on Hexun)
	External corporate social responsibility	excsr	ln (External social responsibility rating scores of listed companies on Hexun)
Moderating variable	CEO narcissism	ceonar	The arithmetic mean of five measurement indicators after standardization
Control variable	Area of the enterprise	area	0-1 variable, 1 for East China, otherwise 0
	Enterprise nature	nature	0-1 variable, take 1 if the firm is state-owned
	Enterprise industry	industry	0-1 variable, take 1 if the firm is a heavy-polluting firm
	Enterprise size	size	ln (Total assets)
	Enterprise profitability	pro	Total profit/operating income
	Proportion of technical staff	tsrat	Number of technical staff/total employees