I remember reading this story about 3 or 4 years ago. There were part 1, 2 and maybe 3 available at my local library.
I remember that, on this planet the reproduction was done by cloning and they were all programme to die at a certain age. I remember it was very cruel and not at all equal.
The only best example I remember is like the people enforcing the law the policemen lived for 400 days.
The medium class of people, the workers and employees lived for 40 years.
The highest class of society, the leaders lived for 400 years
and the queen lived for 4000 years.
There was a Birthday day where everyone that was their time to die in the workers and employees class (wich was the bigest class of individuals) had to go into a big canal in the center of the city and wait for the moment of their death. At this exact moment all the heads of these people simply exploded all at the same time. I remember seing an image of the canal filled with blood and body parts. While awaiting their death these people acted in different ways:
Some were scared to hell and tried to flee but were stoped by the policemen.
Some were partying like it was a normal thing (and it was).
Some were even making love in the canal as their last moment of life.
The nature was completely illegal, This big city was surronded by a little vegetation left on the planet and this place was the "sanctuary" of the Rebels, a group of people determine to bring equality and nature back.
I will take any hint please I've got to read this story back.