This paper develops a holistic framework of questions mo- tivating sustainability research in computing in order to en- able new opportunities for critique. Analysis of systemat- ically selected corpora of computing publications demon- strates that several of these question areas are well covered, while others are ripe for further exploration. It also pro- vides insight into which of these questions tend to be ad- dressed by different communities within sustainable com- puting. The framework itself reveals discursive similarities between other existing environmental discourses, enabling reflection and participation with the broader sustainability debate. It is argued that the current computing discourse on sustainability is reformist and premised in a Triple Bottom Line construction of sustainability, and a radical, Quadruple Bottom Line alternative is explored as a new vista for com- puting research.