Barges or tankers COULD work if necessary, but tanks are much more logistically possible at present... or a combination. I think it's just logistics, as I said earlier. If the world wants to contain the crap it can. Heck, the Japanese could do it if the rest of the world wanted to take one for the team and not take delivery of tanks on order in lieu of saving the planet (yeah, I know... but it's a small world innit?). All it takes is the will and the money and they have said they have lots of money. There are lots of tanks under construction at any given moment all over the world.