This article explores the role of constructive anger in motivating and sustaining climate action. It considers relevant research in climate psychology with special attention to the dynamic between climate-related anger, action, and hope. The psychological research is then applied to a reconstruction of the concept of anger and hope in philosophical and theological approaches. Developing the concept of constructive anger, this article suggests that such constructive anger can be a factor in moving through apathy, fear, and depression and mobilizing toward collective climate action. Climate-related anger can be relieved through collective forms of climate action and the sense of collective efficacy that can emerge in becoming active. These can become a means to generating resistant, active, constructive forms of hope that can be distinguished from deceptive forms of hope.