David Adelman and Ian Duncan propose to combine liability with regulation of geologic sequestration of CO2, providing a useful discussion of the relative advantages and disadvantages of each policy instrument as applied to carbon capture and sequestration (CCS). Further details of how their proposal would be implemented are essential to fully evaluating its merits and likelihood of success. The authors make a valuable contribution to interdisciplinary understanding of the technical and legal issues associated with geologic sequestration of carbon dioxide (CO2) by reviewing and explaining the scientific literature of sequestration preliminary to concluding that risks associated with the technology are misunderstood.