[JoeSchem]

I would think that the equivalent of 30 nukes a year going off in the atmosphere would be rather more noticeable than it is, wouldn't it?

There was an account, back in the seventies I believe, of airline passengers near Alaska noticing a huge explosion out their windows. There were no other reports. So yes, it is amazing that such things can happen without our taking greater notice.

[eno_]

Yup. Volcanic events in the ocean can have the force of DOZENS of big, H-bomb-sized nukes, and nobody notices, because (usually) nobody is there. Maybe a fishing vessel goes missing. THe world is big, we are small.