The earth won't last forever, you are right about that. But the earth is going to end by Jesus coming back to earth. The signs are already here. There are wars, tons of rumors of wars, there are many earthquakes, pestilences, famines, and every country seems to hate eachother. Jesus talks in the Bible in Matthew chapters 24 and 25 about all those things. He says that will happen in the End Times. We are really only waiting for the last sign that Jesus will return. It is the antichrist. He will decieve many and force people to get a microchip in either their right hand or in their forehead. This microchip will allow people to buy and sell. There is only one problem, though. The number on the microchip is the number of the beast. (Satan) That number is 666. Christians can NOT get this microchip! It is the mark of Satan! You know how all this is true? It is because it is happening RIGHT NOW!!!!!!!! Plus, God says this in the Bible. "These words are faithful and true." So, the world WILL end, but not how you said it will.