I have seen all of the ideas about how to modify a hurricane. Many of these ideas although good, aren't enough to modify a hurricane. The best ideas are that of cooling the water temp by dragging iceburgs into the path. The problem with this is you have to know the path (we have a good idea of that nowadays), and you also take much needed ice from an already deteriorating polar region. Not to mention you have to have that iceburg ready and waiting in time to push it in front of a hurricane. My hare brained idea involves cooling the water, but not with polar ice burgs. We would need to cool the entire region of water in the tropics and gulf of Mexico. We would need the water to be cooled just enough to weaken the storm from cat 4 or 5 to cat 1-2. I feel that this can be achieved by stragically placing grids of tubing in the areas of high currents that supply the warm waters to the tropics and Gulf. Running cryogenic material (liquid Oxygen or liquid nitrogen) through these grids would super cool the waters entering into these regions and mix with the warmer water. This would lower the water temp enough so that a hurricane would not necessarily lose strength, but not be able to gain strength. Since most of the storms that enter into the Gulf as a cat 1 or Tropical storm, lowering the water temp can keep these storms from getting more intense.