Based on a constructive reading of Scripture, the apostolic and patristic traditions and deeply rooted in the sacramental experience and spiritual ethos of the Orthodox Church, John Zizioulas offers a timely anthropological and cosmological perspective of human beings as "priests of creation" in addressing the current ecological crisis. Given the critical and urgent character of the global crisis and by adopting a clear line of argumentation, Zizioulas describes a vision based on a compassionate and incarnational conception of the human beings as liturgical beings, offering creation to God for the life of the world. He encourages the need for deeper interaction with modern science, from which theology stands to gain an appreciation of the interconnection of every aspect of materiality and life with humankind. The result is an articulate and promising vision that inspires a new ethos, or way of life, to overcome our alienation from the rest of creation. This outstanding anthology of Metropolitan John's writings on ecology shows what a coherent and compelling contribution Christianity can make to this vital issue of our time. Unfolding its intrinsically ecological aspect dramatically enhances the ecumenical value of his eucharistic ecclesiology.