Growing since 2016
Ecology Day emerged at the celebration of Ecology’s 150th anniversary in 2016, as a result of a round table in the European Parliament, in Brussels.
The date, September 14, is the day on which Ernst Haeckel published “Ökologie und Chorologie” (Haeckel, 1866, II: 286–289, reprinted in Acot 1998: II, 703-706),
By ecology, we mean the whole science of the relations of the organism to the environment including, in the broad sense, all the “conditions of existence”. These are partly organic, partly inorganic in nature; both (...) are of the greatest significance for the form of organisms, for they force them to become adapted. Among the inorganic conditions, (...) we consider the physical and chemical properties of its habitat, the climate (light, warmth, atmospheric conditions of humidity and electricity), the inorganic nutrients, nature of the water and of the soil, etc. As organic conditions we consider the entire relations of the organism to all other organisms with which it comes into contact, and of which most contribute either to its advantage or its harm. Each organism has among the other organisms its friends and its enemies, those which favor its existence and those which harm it. The organisms which serve as organic foodstuff for others or which live upon them as parasites also belong in this category of organic conditions of existence. (...) In a word, ecology is the study of all those complex interrelations referred to by Darwin as the conditions of the struggle for existence
In 2019, two years later, Ecology Day reached an international scale, thanks to its celebration in the United States of America, Russia, India and Mozambique. The official setting of the date depends on the scale of the initiative, which shows an upward trend.