The ongoing nuclear crisis in Fukushima, Japan, has showed us that as long as we have active nuclear power plants, accidents will happen. One month after the tsunami hit the plant, the fate is still unknown. 3 outer containment structures were blown to smitherens, the last line of defense gone. One reactor more than likely in a meltdown.
We have seen that the nuclear fallout has spread around the upper northern hemisphere almost completely. Countries borders mean nothing. 4000 miles of ocean can be covered in 3 days.
I propose the southern hemisphere becomes a nuclear free area.