Oh well Rietto... If they have told you from the beggining you might have not stick arround the 16 eps. This is an old story-teller scheme you see: do not give the meaning of the story at the beggining; let them build some interest in it =)
It took 16 episodes before we even find out the war is over water and that there is severe climate change causing that conflict. This show sucks at explaining wtf the reasons behind things are.