Christian ethics can draw on a very rich tradition that aims at translating ethical arguments into ethical attitudes by equally addressing hearts and minds, deep-seated hopes, and daily life. That is why religious and ecological perceptions can enhance and complement each other in the ethical debate about climate change. The following essay shows a perspective that does not look at the relevant aspects in isolation, but rather in their entirety and unity. Christian ethical thinking adds a special value to the discussion of responsibility for nature in times of climate change, overpopulation, and scarcity of resources. For example, this chapter shows a way to see climate change as a “sign of the times” and gives an answer to the question of which competencies religions have in the diagnosis of the greatest challenges of the present time.