Until some are able to see that there will be two different types of new heavens and earths, there will be confusion
and argumentation getting us nowhere.
Peter spoke of what will take place before we see the final new heavens and new earth.
Not to be confused with the Millennial new earth.
After the Millennium there must come the obliteration of what we now call the planet Earth.
To be dissolved in one massive manifestation of nuclear fission, destroying matter even on the molecular level.
Everything! Gone!
But the day of the Lord will come as a thief in the night, in which the heavens will pass away
with a great noise, and the elements will melt with fervent heat; (nuclear fission) both the earth
and the works that are in it will be burned up.
Therefore, since all these things will be dissolved, what manner of persons ought you to be in holy
conduct and godliness, looking for and hastening the coming of the day of God, because of which
the heavens will be dissolved, being on fire, and the elements will melt with fervent heat?
Nevertheless we, according to His promise, look for new heavens and a new earth, the home of righteousness. (2 Peter 3:10-13)
That speaks of the second New Earth. A completely new creation from God.
The Millennium is to be the first New Earth, which will be a transformation of the present one we now stand upon.