Nuclear Bombs - What's the Difference?

With a termo nuclear bomb, alw say the yield can be whav you wanted. But really, if a hydrogen bomb falls on the city, the there's no hope for you at all. So it's completely different from the atomic age. Atomic age, yes, you could survive, and yes, some or second oed war plans could have worked. But by the time the nuclearage turns to the fairmor nuclear there's no point planning. All you can do is plan to avoid it, not plan to survive it.