Earth is the playground for a essentially immortal group of elites. They are supported by a technocrat class who run the machines of production, and a praetorian guard who enforce the law on the few remaining little people who are allowed to live as menials and slaves.
Most all agriculture, mining, industrial production is done by robots, as is most warfare.
A constant worldwide physical and electronic surveillance system renders any attempt to revolt or achieve political mass useless, as any ringleaders are disposed of immediately.
All the lower classes are implanted at birth with poison chips which can release a lethal dose into the blood stream with a remote command. They may buy and sell only with a issued card. They have no rights and are kept as servants, sex slaves, torture objects, and gladiators. Any elite may kill a slave at any time , with a blood payment to it's master.
The air is filled with tiny nanodrones with DNA analyzers and micro teeth for poison transmittal.
The miracle of medical science allows both organ renewal and immortality for the elites, and the genetic targeting of whole groups of people for extermination.
The air is blue and clean, the water is pure, wildlife freely roams the planet as the shining cities and playgrounds of the psychopaths sparkle under the sunshine.
It can't happen here.