As various government members make promises about funding for flood defences, while wavelets lap gently against the interior walls of thousands of dwellings, my thoughts naturally turn to King Canute. I gather he was a real king (Cnut, Knutr, reign 1016-1035, Danelaw zone only). He seems to have been a very competent leader, so if it is true that he sat on his throne on the seashore and commanded the waves not to advance, I feel sure he did so to make a point to his courtiers about the futility of claiming power over nature, rather than because he actually expected the waves to take any notice. Perhaps there is a lesson for us here. I would guess that a modern King Canute would not trust entirely on grand engineering projects in a costly and perhaps futile effort to cope with forces whose scale was simply too great. I am no expert, but I have consulted people who are, and I am convinced that the key is prevention, or at least mitigation: to plant belts of trees on hilltops and sl...