I believe that our use of fossil fuels in our cars and power stations is damaging the planet, apart from which, they are a finite resource. The extraction of these fuels endangers our planet, as the recent gulf oil spill shows. Also more that 20,000 are killed every year in mining alone. Burning these fuels further damages our planet, only time will tell how significant this is.
Whilst green power is the ideal, practical green generation on a scale to provide a significant proportion of our power is a long way off, and people do not want the blot that these inflict on our landscape, wind-farms, flooding caused by hydro-electric etc..
Nuclear power is, in my opinion, the only current option we have, whilst it is not clean, it is cleaner than fossil fuels, accidents will happen and pollute the environment, but so do fossil fuels. We can engineer safety into nuclear power, every accident make them safer. Extracting fossil fuels become more dangerous as they become scarcer and we take bigger risks to get them.
The disaster in Japan and the devastation caused, was from the earthquake and resulting tsunami, not from the failure of the nuclear plant.
Until we develop cleaner/safer options nuclear fission is our only practical option. (In my opinion -- other opinions are available !)