Due to climate change, sea levels are expected to rise and flood large low-lying areas in many regions of the world. The big question is how we should cope? Should we built dykes or let the sea in?The choice is not easy, but we have to make it. If we build dykes, we can keep the land dry. But it is a costly and sometimes risky choice. According to biologists at University of Southern Denmark, it is worth considering letting the seawater take over. The results might be more beneficial than trying to keep the water out, they suggest.