3 nuclear reactors melted down at 100%. Chernobyl was one reactor 30 some percent. Unit 3 at fukushima alone was a million times more lethal than chernobyl. Unit #4 is hanging on by a thread and is being evacuated now. Mox fuel from unit #4 definitely has the possibility of destroying the world.
No, Fukushima cannot destroy the world as the nuclear disaster that occurred there was not even near the nuclear damage that occurred a Hiroshima or Nagasaki. As the bombing of those two cities did not put a dent in the rest of the world, Fukushima's disaster certainly will not either.
Fukushima is not about to destroy the world. While there is no question that the Fukushima nuclear disaster is just that, a disaster, it is not going to irradiate the planet. There's so much misinformation out there about nuclear power and radiation. For example, did you know the sensationalist headline about tuna on the west coast know showing up as radioactive from Fukushima's accident is true -- they just failed to include the part where you get more radiation from eating a banana. Don't believe the alarmists.