Tikkun Olam: "Repairing the World"—this concept was developed by Jewish mystics in the 17th century in Safed, Galilee. As descendants of Jews expelled from the Iberian Peninsula, they had recently experienced and survived the shattering of creation and the descent of their world into utter inequality. While these mystics had sought to piece the fragments of the world back together primarily through observance of the commandments, prayer, and study, the concept of Tikkun Olam—originating in American Judaism—has experienced a tremendous renaissance over the past thirty years. Jewish communities, groups, and initiatives around the world are striving, in a form of social messianism, to combat the inequalities resulting from strife, social injustice, and environmental destruction through political and ecological activism. This paper will explain the concept of Tikkun Olam using the example of "eco-kosher": Since the environmental movement of the 1980s, the traditional rules and halachot governing kosher food have been expanded to include ecological guidelines. For meat to be considered "eco-kosher," for example, the animal must not only have been ritually slaughtered in the traditional sense and had its blood drained. Moreover, the conditions under which the animal lived prior to slaughter also play a role—namely, species-appropriate animal husbandry, sufficient space to roam, the composition of the feed, and the design of livestock transport. In this way, traditional kashrut is supplemented by modern organic standards. The lecture will use examples to illustrate how Jewish-ecological initiatives contribute to combating climate change and thus restoring equality to creation.