Some very interesting findings on or relating to the cost of climate change in the Pacific (more to come soon on this topic):
Damages to Caribbean countries due to rising sea levels could run to 4-6 billion US dollars per year: this from the Guardian from back in December 2010, which refers to a UN study conducted by the Oxford Centre for the Environment, which I cannot find online (if anybody can find it, please do contact me with it so I can post it). The study shows that the yearly cost of a sea-level rise of 1m could amount to 4-6 billion dollars per year, with the sea encroaching on the land by an average of 100m. The cost figure does not account for other extreme events and biodiversity loss caused by climate change. The Guardian article is not much more specific than that on the methodology; but the study is indicative of the huge costs for the Pacific. I would be interested to see what the data sources are and the methodology behind the study, and whether, in the data-scarce Pacific a similar study could be conducted, or has been attempted.
Total costs of adaptation by region and climate change scenario: The following table from a World Bank study (see hyperlink above) shows that the East Asia and Pacific region will suffer the highest cost of climate change adaptation in the world, but of course lumping the two regions together is meaningless for the Pacific given the enormous relative size of its regional neighbour East Asia.