Kiwi crews exposed to radiation at Mururoa Atoll hold concerns for subsequent generations.
Invisible for humans, but detectable for radiation-filters. A cloud with tiny levels of radioactivity, believed to originate from western Russia, has been detected over Scandinavia and European Arctic.
But the appearance of new chemicals is creating an uncertain future for polar bears, orcas and seabirds.
Facilities for producing weapons grade plutonium believed safe despite fierce flames caused by wildfires.