Tsar Bomba had a yield of 50 megatons. The largest US nuke was 25 megatons. The asteroid which killed the dinosaurs was 100 MILLION megatons, roughly 25000 times the global nuclear stockpile. Yet, mammals still surved the event. The Wilkes Land crater suggests a blast event five times greater had occured previously, but life continued on. Would total nuclear war even be able to kill 10% of humans alive?