In 1989 the Ecumenical Patriarch of Constantinople Dimitrios invited "the whole Orthodox and Christian world" to pray on 1 September "to the Creator of the world: with thanksgiving for the great gift of the created world and with supplications for its protection and salvation". This initiative was welcomed and adopted by the whole Orthodox Church in 1992.
At the same time, the ecumenical discourse of the time included questions about the integrity of creation, peace and justice, and many Christians were already committed to the conciliar process. Part of this process were the European ecumenical assemblies in Basel (1989), Graz (1997) and Sibiu (2007).
Since 1996 the churches, especially in Europe, have been working intensively on the care of creation. The initiative of the Ecumenical Patriarch was taken up both in Graz and in Sibiu. The message of the 3rd European Ecumenical Assembly in Sibiu recommends a time for creation: "We recommend that the period between 1 September and 4 October be dedicated to prayer for the protection of creation and the promotion of a sustainable lifestyle to halt climate change".
2015 the Day of Creation was officially adopted by Pope Francis for the Catholic Church. 2019 Pope Francis adopted also the Season of Creation.