Market Signal
It is a tenet of free market environmentalism that market signals provide information about the environment and its value. Therefore, when people stop buying beachfront property and the price goes down, it is a signal that people are worried about the effects of sea level rise. This should hold true in advance of the phenomenon, too, as rational actors will take into account the effect on resale value in the future.
What, therefore, are we to make of the news that Senator Clinton has just bought beachfront property in Dominica?