Green technologies, interdependencies, and policy

Abstract: The present study explores the technological interdependencies between green and non-green inventions. First, we look at whether inventive activities in environmentally-friendly domains depend on patenting in related technological domains that are not green. Based on patent data filed over the 1978–2014 period, we estimate a spatial autoregressive model using co-occurrence matrices to capture technological interdependencies. Our first finding highlights that the develo- pment of green technologies strongly relies on advances in other green and in particular non-green technological domains, whose relevance for the green economy is usually neglected. Building on this insight, we detect the non-green interdependent technologies that co-occur with green ones and assess whether environ- mental policies affect this particular instantiation of technologies at the country level. The results of the instrumental variable approach confirm that while environ-mental policies spur green patenting, they do not displace the development of the non-green technological pillars upon which green inventions develop. However, at the same time, environmental policies do not enhance patenting in non-green interdependent technologies which would speed-up the transition towards sustainable economies.