I used to think that the 'ruining of the earth' in Genesis & Revelation described moral collapse, but now am more inclined to believe that it will be both a limited moral & physical destruction.
The comments regarding nuclear methods appear to be very possible in view of Revelation
16:13, 14 - "And I saw three unclean inspired expressions that
looked like frogs come out of the mouth of the dragon and out of the
mouth of the wild beast and out of the mouth of the false prophet. They are, in fact, expressions inspired by
demons and they perform signs, and they go out to the kings of the
entire inhabited earth, to gather them together to the war of* the
great day of God the Almighty."
It's the earth's military powers who are assembled to battle each other for the last time.
If God was going to destroy them, they wouldn't need to be "gathered together" would they? He would simply destroy them where they are!
The 3 instigators of Armageddon are the dragon, the wild beast, and the false prophet - not God, so a limited nuclear exchange might be deployed - thanks to the "inspired expressions."
* to gather them for the battle on the great day of God Almighty. (NIV)
It's God great day, but not His battle. His battle occurs after the 1000 years have ended. Just thinking aloud.