As public awareness of climate change and the ecological crisis increases, this paper explores whether Catholic Church discourse on climate change might help advance interreligious dialogue and respect between Catholics and Jews. Although Nostra Aetate, a declaration of the Second Vatican Council (1962-1965), significantly reset Catholic-Jewish relations, the endurance of anti-Semitism in everyday culture in historically Christian countries undermines the Church's insistence on authentic respect for Jews and Judaism. I argue that Laudato Si', Pope Francis's landmark encyclical on the environment, and subsequent Vatican statements and actions on ecological sustainability provide an untapped resource that can foster renewal in Catholic-Jewish solidarity. I will highlight the trans-religious, cultural accessibility of the Church's discourse and also show how it is aligned with the environmental views expressed by majorities of Jews and Catholics in U.S. public opinion surveys. I conclude that the Church's discourse, if thoughtfully harnessed, can mobilize localized cross-religious dialogue and political action on ecological sustainability. Inter-religious mobilization around shared concerns may, in turn, foster a more wholistic mutual respect for the Other.