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This briefing presents evidence that the detonation of the nuclear warheads carried on just one UK Trident submarine would lead to vast quantities of smoke being generated that would led to a sharp climate cooling, causing a global crop failure which would threaten the lives of some 1 billion people. This would be in addition to the deaths of over 10 million people killed directly by blast, fire and fallout from the nuclear explosions.

SGR briefing by Dr Philip Webber; 26 February 2013.