end-of-pipe technology(An approach to pollution control which concentrates upon effluent treatment or filtration prior to discharge into the environment, as opposed to making changes in the process giving rise to the wastes)
endangered animal species(Animals, birds, fish or other living organisms threatened with extinction by natural or human-induced changes in their environment)
endangered species(IUCN, One of the three degrees of "rarity" drawn up by the International Union for the Conservation of Natural Resources. All plants and animals in these categories need special protection. Endangered species are those species in danger of extinction unless steps are taken to change the cause of threat and decline)