The issue focused on nuclear winter was discussed by Professor Philip Zelikow and Professor Philip Davies on BBC Radio 4's Today Programme on Tuesday 23rd December 2004. Phil Davies stated that there were evidence that nuclear winter did occur and was possibly responsible for some part of the 1945 atomic bombings of Hiroshima and Nagasaki. Professor Phillip Zelikow argued that nuclear winter did not occur as described by Professor Davies and instead pointed out that such events could only occur under extremely abnormal circumstances and could only occur under extremely relaxed assumptions about climate