Abstract
The problem of the unsustainability of our world has a philosophical reason. This reason, this origin, is an anthropological philosophy, a reductionism. Since the Modern Age the main social organization models have been based on specific anthropological views and each of them has led to social distortions. The anthropological vision that today leads to the distortion of unsustainability is that of homo economicus. This “homo” has three fundamental characteristics: to be a perfect and complete individual; to be rational and self-centric being; to have in business his natural habitat. However, the human being is not just an economic being, but something much more complex. It is a being-with (the person does not have relationships, but is related), a being-for (the person is not only driven by needs, but also attracted by values, he has an end, a purpose) and a being-in (the person lives in a context, a habitat, an environment that he is called to take care of).