I often make the point in talks that the fictional world that mainstream economists promote leads to poor decisions in the real world by our policy makers. We saw that in the 1980s and 1990s with the large scale privatisations of public enterprises, touted as employment-enriching, productivity-boosting strategies to provide ‘more money for government to spend on welfare’. We now have enough data to know that in almost all the examples the promises have not been fulfilled and the outcomes worse than what would have been had the enterprises been maintained in the public sector and motivated to provide public service rather than private profit. The same mistake is being made with the response to the climate emergency. Economists and commentators are claiming we need to ‘repeat the privatisations’ to get enough investment cash to facilitate the necessary restructuring. They are wrong and if governments, operating on the assumption that they do not have ‘enough cash’, rely on private funding for climate initiatives then the outcome will be poor for societies.