Our idea of ecology is undoubtedly linked to the defense and preservation of the environment that surrounds us, an environment that is composed of goods that belong to someone and goods that belong to everyone because they are common goods. We know very well that human activity interferes with local and global ecological balances and this is particularly true for common goods, those that Roman law called res communes because by their nature they cannot be privatized, like the atmosphere or the oceans. Since they belong to no one, yet are available to everyone, the res communes, which in Anglo-Saxon law have become the global commons, are particularly exposed to the consequences of excessive exploitation. Since you don’t have to pay to fish in the high seas, for example, our oceans are severely affected by overfishing. Unfortunately, the same happens for everything that is available for free, such as the collection of sand from river banks or extraction of water from the oldest aquifers, which were filled in geological eras but are being emptied at an alarming rate. It is the tragedy of the commons, a sadly familiar picture that must be fought precisely thanks to the growing ecological awareness. If we want to leave a healthy planet to future generations, we need to promote a conscious and sustainable use of Earth’s resources, but how far should we go? In other words, what are the boundaries of the environment we want to protect? Where does end what surrounds us and allows us to live and operate?