The spaceship

The year is 3081 humans have destroyed the earth due to chemical outbreaks from nuclear factories around the world.Earth's elder population died off while the younger generations made it to the Spaceship except one man who was able to make it there due to living in the woods.When they entered the spaceship every human was assigned to a seat which had everything a human could dream of from free food to every sort of entertainment they had robots for every job but what they did not know was that the ration were limited.It was a very huge spaceship which carries 3.6 billion boys and girls and one elderly man who always remembered earth and thought something was suspicious about this spaceship.