Which of the following sentences illustrates proper sentence structure?

  1. Unless the world controls its population, mankind will continue to face one problem after another.
  2. Unless the world doesn’t control its population, mankind will continue to face one problem after another.
  3. Unless the world controls its population, until then mankind will continue to face one problem after another.
  4. Unless the world fails to control its population, mankind until then will continue to face one problem after another.

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