In Catholicism, confession starts with repenting a person’s bad thoughts, words, and behaviors. Confessing is then to be finalized as practical atonement. This paper explores the possibility that the process of confession may be connected to ecological repentance, self-confession, and penance. The paper focuses on the fact that confession possesses a practical meaning that cannot be overlooked when materializing the concept of “ecological repentance,” which has become widely known thanks to Pope Francis’ encyclical Laudato si’. By examining Laudato si’ from a theological and historical perspective, this paper reinterprets confession and repentance as processes of disposal of craving [excretion] and revival. Furthermore, it explores whether the concept of penance linked to confession can be understood as ecological penance from an eco-theological perspective. As a practical example, the paper connects atoning behavior to the Catholic tradition of pilgrimage and suggests that walking can be viewed as ecological penance. The paper thus imagines a “pilgrimage mileage” application based on a compensation-oriented reward system. Through this app, walking acquires meaning as ecological penance, which creatively revives disposal [excretion], and the number of steps taken by the walker is linked to a donation.