Thousand Years Ahead On Earth... What Would Happen?

A thousand years of hibernation on planet earth ... WHAT WOULD HAPPEN? Imagine that all the inhabitants of the earth decide to hibernate for ten centuries, the entire human population hibernated in special underground bunkers, all lying in comfortable bunks with their animals next to them, so as not to leave them alone. When the last terrestrial is also placed, the alarm clock will be programmed a thousand years ahead in the future. Millions of robots will take care of keeping every single sleeping human under control. They will check both health conditions and surface changes. The whole planet will be left to itself: houses, offices, cities, entire nations will be returned to nature. After a day, power plants around the world will start to shut down, TV, internet and all that is electric. The only city still illuminated on the planet will be Las Vegas, it is in fact entirely powered by renewable energy.