I interpret the actual destruction of the world by fire coming many millennia after the second coming of Christ.
As for a description of the end of the thousand year period ( and these could be interpreted as prophetic years ) AFTER the second coming of Christ, start here: http://www.biblegateway.com/passage/?search=Revelation+20&version=KJV
What I mean to say is that God, through the Christian’s New Testament, said that the Earth would be destroyed by fire?
I believe this is the verse they are thinking of.
2 Peter 3:10-13
10 But the day of the Lord will come like a thief. The heavens will disappear with a roar; the elements will be destroyed by fire, and the earth and everything done in it will be laid bare.
11 Since everything will be destroyed in this way, what kind of people ought you to be? You ought to live holy and godly lives
12 as you look forward to the day of God and speed its coming. That day will bring about the destruction of the heavens by fire, and the elements will melt in the heat.
13 But in keeping with his promise we are looking forward to a new heaven and a new earth, where righteousness dwells.
Could it be a massive lightning storm of unparalleled proportions? How about a solar storm hitting the Earth?
It looks like the “day of God” and this massive firestorm are on the same day. Correct me if I am wrong.