To ELI5 your question: the infrastructure that makes the world go round is located in the zones that will be flooded as sea level rises. It will be a huge cost

To ELI5 your question: the infrastructure that makes the world go round is located in the zones that will be flooded as sea level rises. It will be a huge cost to migrate this, and it isn't being done, which means a potential for massive disruptions in everything that makes society possible. It is SO expensive to address, 95% of the world's politicians are just pretending it isn't happening.