The impact of innovation on environmental quality: Evidence for the non-linear relationship of patents and CO2 emissions in China

We seek to test whether innovation, measured by the number of accepted patents improves or worsens the environment in China. We hypothesize the existence of an inverse U-shaped curve, which differs by industry and provincial level of development. In that context, we test for a quadratic relationship between accepted patents and CO2 emissions per capita in 30 provinces and 32 economic sectors of China. We use a novel fixed effect panel data quantile (FEQR) regression estimator and differentiate between energy-intensive and non-energy intensive sectors, as well as between more and less-developed provinces of China. We find evidence for an inverse Ushaped relation between patent generation and CO2 emissions for both, more and less energy-intensive sectors, suggesting that at low levels of innovation new technologies tend to be dirty, but at high levels of innovation new technologies tend to be green. The same relationship holds for less-developed provinces as well. For moredeveloped provinces, we find the opposite relation, which we explain with a rebound effect.

Automated summary

The study finds an inverse U-shaped relationship between innovation and the environment in China, with new technologies being dirty at low levels of innovation and green at high levels. This relationship is affected by different industries and levels of provincial development.