If a failure of the Wilkes Subglacial Basin "ice plug" in the next few centuries were to endanger the East Antarctic Ice Sheet, it will take up to this long to melt completely. Sea levels would rise 3 to 4 meters. (One of the potential long-term effects of global warming, this is separate from the shorter term threat of the West Antarctic Ice Sheet.) According to one estimate called the Doomsday argument, as proposed by Australian theoretical physicist Brandon Carter, there's a 95 percent chance that humans will have died out in 10,000 years. That argument has been heavily debated, so we're not entirely sure if people will be around or not. But if they are, in 10,000 years there will be no regional genetic variation between humans. That's not to say people will all look the same, but whatever genetic differences there are - such as blue eyes versus brown - will be evenly distributed across the planet.