Već u prošlom stoljeću, otkako je počelo zanimanje za ekološke probleme ili probleme ambijentalne ekologije, započelo je zanimanje ambijentalista i ekologa za sv. Franju Asiškoga i njegov spontani pristup prirodi. To je potvrdila i Katolička Crkva kada ga je 29. studenog 1979. proglasila zaštitnikom djelatnika ekologije. Sv. Franjo bio je kao svetac poznat po svojoj jedinstvenoj duhovnosti, posebice po svome putu siromaštva i po svojoj ljubavi prema siromasima, ali je u naše vrijeme postao poznat kao Franjo ekolog diljem svijeta, pa i u znanstvenim krugovima bez obzira na religiju. U članku se raspravlja o Franjinu bratstvu sa stvorenim, o bitnim oznakama franjevačke teologije prisutnosti, o samoj pjesmi stvorenja koju i papa Franjo citira 12 puta, dok se u zadnjem dijelu proučava Franjina Pjesma stvorenja, i aktualizira njezina originalnost, i povijesna i aktualna. Ever since the last century, when the interest in ecological problems or the problems of ambient ecology began, the ambientalists and ecologists’ interest in St. Francis of Assisi and his spontaneous approach to nature also began. This was confirmed by the Catholic Church when on November 29, 1979, it proclaimed him the patron saint of environmentalists. As a saint St. Francis was known for his unique spirituality, especially for his path of poverty and his love for the poor, but in our time he has become known as Francis the Ecologist all over the world, even in scientific circles regardless of religion. The paper discusses Francis’ brotherhood with all creation, the essential features of the Franciscan theology of presence, the Canticle of Creation itself, which the Pope quotes 12 times, while in the last part it studies St. Francis' Canticle of Creation , and actualizes its originality, historical and current alike.