Rev 21:1 Now I saw a new heaven and a new earth, for the first heaven and the first earth had passed away. Also there was no more sea.
The LORD revealed to John this new heaven & new earth. He also saw how it was different than the old. The earth as we know it will be no more. A very huge change is no more seas. However, all of this will be a huge contrast. God is not interested in using the old fallen systems of this world. Man has completely, due to sin, polluted & corrupted this world. Humanity as a whole, has not been good stewards of what God has given them. But, our God is mot limited as we are. He creates again.