“…They propose two kinds of distinct conclusions: one is “promotion viewpoint”, indicating that human capital promotes green growth (or reduces carbon emissions) [ 24 , 25 , 26 , 27 , 28 , 29 ]; the other is “inhibition viewpoint”, arguing that human capital inhibits green growth (or increases carbon emissions) [ 30 , 31 ]. Other literature believes that the relationship between human capital and green growth is uncertain, changing with different time periods, different industries, macroeconomic variables and human capital regime level in various regions [ 32 , 33 , 34 ]. A few studies confirm the possible non-linear relationship between human capital and green growth [ 35 , 36 , 37 ].…”