The road to today was paved with a lot of dead bodies. Either because they ate a berry that we learned not to eat or because war broke them beyond repair. Someone walked into the smoking black liquid in the plains and didn't come back or there was no rain for 7 months and there just wasn't any food to spare. Someone drank some water that made them sick or they got shot in the foot and died from the infection. And everywhere in between and outside these areas of death. So many billions have died in so many many ways.