2 Peter 3:10-13
10 “But the day of the Lord will come like a thief, in which the heavens will pass away with a roar and the elements will be destroyed with intense heat, and the earth and its works will be discovered.11 Since all these things are to be destroyed in this way, what sort of people ought you to be in holy conduct and godliness, 12 looking for and hastening the coming of the day of God, because of which the heavens will be destroyed by burning, and the elements will melt with intense heat! 13 But according to His promise we are looking for new heavens and a new earth, in which righteousness dwells.”
With a roar: In a moment God destroys the heavens and the earth. This means that humans do not ultimately destroy the world. Rather, Christ returns to whatever state humans leave the world in and makes a new heavens and new earth.
Conduct and godliness: God hates sinfulness and fallenness because it is not of His eternal nature. Because this reality is passing away, Christians ought to live righteously and not flirt with their old way of living in sin. Because we are godly by nature we can live righteously.
Intense heat: This is a glimpse of the manner in which Jesus will remake the heavens and the earth. Apparently, there is a one-time intense event that Jesus uses to bring about a new heavens and a new earth in which righteousness dwells. Notice that this is not God making this current earth better. This is a completely new earth.