Someone should start a sea level betting market.
Samoans and others can take positions which will pay out around the time they start to flood. Thanks to widespread ignorance in the largest economy in the world, this should provide a readily accessible means to insure against their losses.
All that is needed is a financial intermediary that can be relied upon over the relevant timeframes.
(In the event that Pacific Islands do not get overrun by rising seas, I do not imagine that Pacific Islanders would bemoan their financial losses which can only occur if their homes are not taken by the sea.)