Humanity today is confronted with what might be called the Great Capitalist Climacteric. In the standard definition, a climacteric (from the Greek klimaktēr or rung on the ladder) is a period of critical transition or a turning point in the life of an individual or a whole society. From a social standpoint, it raises issues of historical transformation in the face of changing conditions. In the 1980s environmental geographers Ian Burton and Robert Kates referred to "the Great Climacteric" to address what they saw as the developing global ecological problem of the limits to growth…. I will use the term the Great Capitalist Climacteric here to refer to the necessary epochal social transition associated with the current planetary emergency. It refers both to the objective necessity of a shift to a sustainable society and to the threat to the existence of Homo sapiens (as well as numerous other species) if the logic of capital accumulation is allowed to continue dictating to society as a whole. The current world of business as usual is marked by rapid climate change, but also by the crossing or impending crossing of numerous other planetary boundaries that define "a safe operating space for humanity."