You've got potential new threats arising
from «the Arab Spring»,
from Iran's likely gaining a
nuclear weapon,
from China growing more belligerent in Asia,
from piracy in the Indian
Ocean and
from Venezuela's alliances with China and Iran.
When it comes to radiation, the
nuclear weapons testing conducted
from the 1940s to the 1980s contributed orders of magnitude more radioactivity to the
oceans than Fukushima (even when combined with Chernobyl, a much larger
nuclear catastrophe).