Secular apocalypse, apart from the religious apocalypse, is the popular belief that a crisis is looming, whether it be the ozone layer, or global warming, or pollution of the air or water, or a population explosion.
An apocalypse (religious), in the terminology of early Jewish and Christian literature, is a revelation of hidden things given by God to a chosen prophet; this term is more often used to describe the written account of such a revelation. Apocalyptic literature is of considerable importance in the history of the Judeo-Christian-Islamic-Rastafarian tradition, as beliefs such as the resurrection of the dead, judgment day, heaven and hell are all made explicit in it. Apocalyptic beliefs predate Christianity, appear in other religions, and have merged into contemporary secular society, especially through popular culture. In English, the word apocalypse now commonly refers to the end of the world.
The history and study of religious writings on this topic is eschatology, and can be traced back to the earliest days of civilization. Famous myths describing the end of the world include the Norse story of Ragnarok and the Book of Revelation.