Politics (from Greek: πολιτικά, translit. Politiká, meaning "affairs of the cities") is the process of making decisions that apply to members of a group.
I can't help feeling wary when I hear anything said about the masses. First you take their faces from 'em by calling 'em the masses and then you accuse 'em of not having any faces.
J. B. Priestley in Saturn Over the Water (1961) ch. 2.
Like all ecosystems on Earth supporting animal and plant life, aquatic ecosystems need oxygen. However, oxygen availability in these systems is threatened by global warming and excessive input of nutrients such as from agriculture and wastewaters, known as eutrophication.