There is a lot of debate and worry about climate change.  Most are worried about warming and sea level rises, which would cover coastal land and reduce usable landmass.  Others are worried about global cooling.  A significant swing in either direction would substantially change the latitudes at which human life is most comfortable.

Which is where seasteads come in.  The more of the earth's population and economy which are on seasteads, the more robustness the world has against climate change.  Unlike traditional buildings on land, seasteads are geographically flexible.  Our main motivation for this is to empower people to create and choose societies to live in, but like any great idea, it has all sorts of accidental benefits as well.