Act-utilitarianism is an utilitarian theory. It is the belief that an action becomes morally right when it produces the greatest good for the greatest number of people. Utilitarianism is a theory developed by John Stuart Mill, who was one of the most influential figures in the history of classical liberalism. Mill was a proponent of Utilitarianism, which is known as an ethical philosophy or idea in which the happiness of the greatest number of people in the society is considered the greatest good.//
Utilitarianism is also a version of Consequentialism, which is a theory that the moral/ethical rightness of an action depends on the consequences of an action. The moral status of an act is determined solely by its consequences. According to the theory, if the consequences are good, then the act itself is the right thing to do; if they are bad, then it is the wrong thing to do. Utilitarianism is based on the Hedonist principle which believes that pleasure is the only thing inherently good.//
The Act Utilitarianism follows the Greatest happiness principle: the right action is the one which produces the greatest overall happiness (pleasure minus pain) for all concerned.//
Justice is focused in maximising happiness on the majority of people, that is, without taking into account minority. For example, if to save five lives you have to kill one, then is the right thing to do, therefore, it focuses on the happiness of the majority.//
Furthermore, there are two types of justice: on the one hand, retributive view which defends that a punishment proportional to the offence, and, on the other hand, Utilitarian which defends that a punishment is just (or right) if it maximises happiness, regardless of whether it is proportional or whether the punished committed the crime.// According to its critics, Utilitarianism can imply that we should in certain situations treat people unfairly, violate their moral rights. Some critics say that Utilitarianism "does not take seriously the distinction between persons”& that causes a problem.//
In the CD I will atack the theory from the point of view of the climate change. Nowadays, humanity is facing a threat that will shape our future, climate change is already having effects on our planet and it’s people.