In a letter published on 6 August Pope Francis has announced a World Day of Prayer for the Care of Creation:
Sharing the concern of my beloved brother, Ecumenical Patriarch Bartholomew, for the future of creation (cf. Laudato Si’, 7-9), and at the suggestion of his representative, Metropolitan Ioannis of Pergamum, who took part in the presentation of the Encyclical Laudato Si’ on care for our common home, I wish to inform you that I have decided to institute in the Catholic Church the “World Day of Prayer for the Care of Creation” which, beginning this year, is to be celebrated on 1 September, as has been the custom in the Orthodox Church for some time.
The purpose of the day will be to
offer individual believers and communities a fitting opportunity to reaffirm their personal vocation to be stewards of creation, to thank God for the wonderful handiwork which he has entrusted to our care, and to implore his help for the protection of creation as well as his pardon for the sins committed against the world in which we live. The celebration of this Day, on the same date as the Orthodox Church, will be a valuable opportunity to bear witness to our growing communion with our Orthodox brothers and sisters. We live at a time when all Christians are faced with the same decisive challenges, to which we must respond together, in order to be more credible and effective. It is my hope that this Day will in some way also involve other Churches and ecclesial Communities, and be celebrated in union with similar initiatives of the World Council of Churches.
The day has been incorporated into the Cycle of Prayer under the Autumn Intention: The Harvest, the Fruits of Human Work, and the Reverent Use of Creation.