The battle lines are being (re)drawn in the world of geopolitics: wars in Europe and the Middle East, tension over Taiwan, Putin visiting North Korea. So, more than three decades after the Cold War ended, what are the chances of a nuclear war? How could it start, play out - and how would New Zealand be affected? And, with Aussie politicians procuring nuclear-powered subs and proposing nuclear power stations, are we ready for a conversation about our identity-defining nuclear-free stance?