What nuclear winter would really be like - as scientists call for 'urgent' public education

From Threads to The Day After, 'nuclear winter' has been portrayed in science fiction blockbusters for years - but what would the cataclysmic aftermath of a nuclear attack really be like? Smoke from the fires started by nuclear weapons would rise into the atmosphere, blocking out the sun. The resulting perpetual darkness would mean freezing temperatures and crop failure, followed by mass starvation and death. While it sounds very much like a fictional scenario, an expert describes a nuclear winter as a real and'horribly contemporary' risk due to Russia's war on Ukraine. It follows scientific advice of how best to survive a nuclear attack, after Putin has made a series of nuclear threats since the start of Russia's war on Ukraine last year.