If the state outsources a responsibility to private actors to plant trees, is that necessarily a bad thing? Surely, one would think not. Still, in constitutional theory, there are many forceful arguments against privatisation. One of the core arguments against privatisation is the question of who ought to do what and what it means for a policy area to be inherently public. In this paper, I am interested in varieties of privatisation and in particular what privatisation means in the context (...) of climate change. The aim of the paper is to show that precisely because there is a variety of privatisation, in some areas, such as the environment and regarding climate change, we may discuss the question of ‘duty’ rather than privatisation as such. (shrink)