New Jerusalem will be fresh on earth after GOD will clean up the earth as old Jerusalem. The Millennialism (1,000 years reign of Our King Jesus) will be ending after the battle will be armdraggon between Devil's army and Jesus' army. JESUS WILL BE VICTORY OVER DEVIL. Then GOD will order the old earth and heaven to be passed away. GOD put New Heaven and New Jerusalem. That is how!
"And I saw a new heaven and new earth: for the first heaven and the first earth were passed away' and there was no more sea. And I John saw the holy city, New Jerusalem, coming down from God out of heaven, prepared as a bride aborned for her husband." Revelation 21:1,2