The scientific dimension of risk regulation is obvious. It is accepted that a measure banning a pesticide is to be based on toxicology studies and in particular on the data proving harmful effects for human health or the environment. A more subtle determinant of risk regulation is the ethical dimension of the decisions adopted to control the social risks emerging from new technologies. It is in this context that a document such as the Encyclical letter Laudato Si, on care of the common home of Pope Francis could offer important reflections on how public policy on science and technology could be enriched by including an ethical perspective. The Laudato Si encyclical letter has been accompanied by wide public attention, spurred on by both the huge popularity of Pope Francis and the announced choice of devoting, for the first time in the history of the Catholic Church, an entire document to environmental issues.