For decades, the Ecumenical Patriarchate has been at the forefront of the global fight against the climate crisis and the preservation of Creation: since 1989, commitment to the natural world has been a key pillar of the Phanariot See's work. This contribution reflects on the efforts of "Green Patriarch" Bartholomew I and the complex of initiatives he has led - such as the Day of Prayer for the Care of Creation, the Halki Summits and environmental ecumenism - highlighting the theological pathways behind the cosmic-Eucharistic vision of life and environment, a practical example of the "Liturgy after the liturgy".