It would seem to me that Japan has had its share of bad environmental pollution even prior to this latest accident. Its not their fault they had and earth quake and tsunami, but one must ask the question if more could have been done to prevent this accident. In 20:20 hindsight it would have made sense to provide water tight areas for electricals and controls, but they must have thought the simple sea wall barrier was enough, they could have used more redundant engineered barriers. Putting electicals and backup generators in water tight areas, up high or in water tight vaults could have gone a long way to maintain control. They were just not prepared enough to deal with the earth quake and tsunami at that power plant. I expect the whole industry will now see stiff competition from other energy sources like nat gas, lng and coal driven power plants.
As much as I think they could have done a better job in handling the crisis, but it's easy to criticize at hindsight, how to plan for all the possible natural disaster? Maybe, in future we would have tsunami much higher than one would see now.
To guard against a recurrence all reactor designs that's new and old reactors need to incorporate fail-safe systems in which emergency cooling is supplied without human intervention that will be so redundant they cant fail.