Based on the way continents are currently drifting, this map shows what Earth will look like in 250 million years. One giant supercontinent.
Two hundred and fifty million years ago, nearly all land mass above sea level was squashed together into one giant supercontinent, called Pangea. During this time, invertebrate life gave way to small vertebrates on the land and sea, to amphibians, to reptiles, and eventually large land and sea animals. Then the mega-continent began breaking apart, isolating that life to the point where one continent could successfully grow koala bears and thus justify the entire painful and tedious process of evolution.
But continents can't stay apart for long. It seems that supercontinents have been forming and re-forming throughout the four billion year history of the earth. Right now, the continents are scattered and isolated, but they're on a collision course, and will smush together to form another supercontinent, Pangea Ultima within the next 250 million years.
India has already smashed into Asia, creating the Himalayas, and Africa is jetting up towards Europe. North and South America will unite and then head over towards Afreurasia. Lastly, the most remote of continents, Antarctica, will slide off the south pole and press up against Australia. The result will be the Americas, Eurasia, and Africa forming a ring around a large, landlocked sea, with Antarctica and Australia separated from them by just a small strip of water. What will that set the stage for?