Bodansky’s paper focuses on the regulation of greenhouse emissions from maritime transport. There are many options, using known technologies, for reducing emissions from shipping, involving changes in ship design or operational practices. The IMO’s Second Greenhouse Gas Report report estimated that these design and operational changes might reduce emissions per tonne-mile by 25-75%. Many of these design and operational changes are no regrets measures, meaning that they have negative costs, and could be adopted without harming the competitiveness of the shipping industry, even if no one else were doing anything to control their emissions.