The earth will have 8 billion by 2020 and 9 billion by 2050. The classic model of capitalism is designed for growth and expansion. Just like the USA grew in the 19th and 20th. From some 5 million in 1776 to 300+ million nowadays. From emptiness till a fully occupied world (see this constant examples of how many earths more are needed to sutain US, EU, Japan, second world, third world living standards). I read that the equilibrum of what the earth can sustain, and the amount of pollution it can process vs. how much humanity in total consumes and produces was coming apart already in the mid 1970s. And the gap increases ever since. Wiseguys can tell that there could be enough food if only it was distributed evenly but it is never distriuted evenly and never will be. Huge infrastructures for those populations had to be created out of the blue. Now this model is not more valid in a world with so many people in it. Only Antarctica, deserts high mountains are empty the rest is inhabited and cultivated. Homo sapiens had the first 100.000 years spent in family clans of 25-50. Since 10.000 BC with the Agricultural revolution this has changed and for the first 8 millenia the agriculturers lived in villages of a few hundred. BTW the max. of people whom you can really 'know'. Human psychology. Rome was the first million city, some 2000 years ago. It collapsed and this 1 million Hurdle was achieved 1800 years later again by London. At the time when shortly after world wars were breaking out, as humanity has filled the earth with 1.8 to 2 billion people. And the redistriution armwrestling was done in two rounds. With the birth of the A and H bombs to coold down eventual hotheads lusting for global wars. The third cold world war saw the increase of the population from 2,2 billion in 1945 to some 5 billion in 1989. The 'End of History' period Fukuyama saw another 2 billion added. So now this growth model has come to an end and the elite must find out some ways to put people in the mental existential state that enables us to bear battery hen or eusociate insects (bees, thermites) conditions that basically totally contradict human nature. Well we are adaptable, but still, living in a thermite state is not exactly your dream. The economic model of this full world is still elaborated, but we are now in the era where quantity reigns. The economic ecological, spiritual crisis are sure signs of it. In short: there will be a bunch of crises and wars as this new world is coming into being. Maybe some future 'Pax Romana' can be found maybe not. 'Pax Americana' as it is now might be replaced with some multipolar model, but the need for consensus among heads will be there. Otherwise humanity is toast. Life not. Life as such has survived much worse events than a nuclear war, see Deep impact, Planet of the Apes, Outbreak, Zombie holocaust, King Kong etc. Life will continue. With or without us is the question- be or not to be ?