See this article in the NYT by Jeffrey Sacks: Insuring for Disasters. Some excerpts:
Insurance would reveal how vulnerable certain parts of the world are to rising costs of disasters, including those associated with global warming. But at least we’d be able to begin to account for this. It would provide a powerful way to drive mitigation and adaptation investments, a point emphasized in recent years by Rowan Douglas of the insurer Willis Group.
A global system of disaster insurance would of course not be perfect and would take time to implement, but could save many lives and livelihoods in the years ahead, and help vulnerable low-income countries like Haiti and Nepal chart a path to sustainable development.