The Asian Development Bank says climate change and other environmental factors continue to outpace the resilience of Pacific Island economies.
The ADB has forecast strong economic growth for most Pacific Island countries in 2015.
However Solomon Islands, whose capital was ravaged by flooding last year, and Vanuatu, this month devastated by Cyclone Pam, are two economies that have sustained big setbacks.
The ADB's Pacific economist Christopher Edmonds says in some ways Pacific economies are becoming more resilient to external impacts, by developing responses such as trust funds.
But he says natural disasters have a habit of landing big blows.
"ADB is working along with other development partners to increase the resilience of the economies by climate-proofing the infrastructure for example, working a lot on urban development plans to move the population away from flood prone areas, near the coast, things like that. So it's an ongoing activity at the same time. You do get the sense some time that the environment is changing faster than the countries are."