Sapiens and Homo Deus

by Yuval Noah Harari

  Conversely, ethical judgements often hide within them factual statements that proponents don’t bother to mention, because they think they have been proven beyond doubt. Thus the ethical judgement ‘human life is sacred’ (which science cannot test) may shroud the factual statement ‘every human has an eternal soul’ (which is open to scientific debate). Similarly, when American nationalists proclaim that ‘the American nation is sacred’, this seemingly ethical judgement is in fact predicated on factual statements such as ‘the USA has spearheaded most of the moral, scientific and economic advances of the last few centuries’. Whereas it is impossible to scientifically scrutinise the claim that the American nation is sacred, once we unpack this judgement we may well examine scientifically whether the USA has indeed been responsible for a disproportionate share of moral, scientific and economic breakthroughs.

  This has led some philosophers, such as Sam Harris, to argue that science can always resolve ethical dilemmas, because human values always conceal within them some factual statements. Harris thinks that all humans share a single supreme value – minimising suffering and maximising happiness – and therefore all ethical debates are factual arguments concerning the most efficient way to maximise happiness.5 Islamic fundamentalists want to reach heaven in order to be happy, liberals believe that increasing human liberty maximises happiness, and German nationalists think that everyone would be better off if Berlin is allowed to run the planet. According to Harris, Islamists, liberals and nationalists have no ethical dispute; they have a factual disagreement about how best to realise their common goal.

  Yet even if Harris is right, and even if all humans cherish happiness, in practice it would be extremely difficult to use this insight to decide ethical disputes, particularly because we have no scientific definition or measurement of happiness. Consider again the case of the Three Gorges Dam. Even if we agree that the ultimate aim of the project is to make the world a happier place, how can we tell whether generating cheap electricity contributes more to global happiness than protecting traditional lifestyles or saving the rare Chinese river dolphin? As long as we haven’t deciphered the mysteries of consciousness, we cannot develop a universal measurement for happiness and suffering, and we don’t know how to compare the happiness and suffering of different individuals, let alone different species. How many units of happiness are generated when a billion Chinese enjoy cheaper electricity? How many units of misery are produced when an entire dolphin species becomes extinct? Indeed, are happiness and misery mathematical entities that can be added or subtracted in the first place? Eating ice cream is enjoyable; finding true love is more enjoyable. Do you think that if you just eat enough ice cream, the accumulated pleasure could ever equal the rapture of true love?

  Consequently, although science has much more to contribute to ethical debates than we commonly think, there is a line it cannot cross, at least not yet. Without the guiding hand of some religion, it is impossible to maintain large-scale social orders. Even universities and laboratories need religious backing. Religion provides the ethical justification for scientific research, and in exchange gets to influence the scientific agenda and the uses of scientific discoveries. Hence you cannot understand the history of science without taking religious beliefs into account. Scientists seldom dwell on this fact, but the Scientific Revolution itself began in one of the most dogmatic, intolerant and religious societies in history.

  The Witch Hunt

  We often associate science with the values of secularism and tolerance. If so, early modern Europe is the last place you would have expected a scientific revolution. Europe in the days of Columbus, Copernicus and Newton had the highest concentration of religious fanatics in the world, and the lowest level of tolerance. The luminaries of the Scientific Revolution lived in a society that expelled Jews and Muslims, burned heretics wholesale, saw a witch in every cat-loving elderly lady and started a new religious war every full moon.

  If you had travelled to Cairo or Istanbul around 1600, you would find there a multicultural and tolerant metropolis, where Sunnis, Shiites, Orthodox Christians, Catholics, Armenians, Copts, Jews and even the occasional Hindu lived side by side in relative harmony. Though they had their share of disagreements and riots, and though the Ottoman Empire routinely discriminated against people on religious grounds, it was a liberal paradise compared with Europe. If you had then sailed on to contemporary Paris or London, you would have found cities awash with religious extremism, in which only those belonging to the dominant sect could live. In London they killed Catholics, in Paris they killed Protestants, the Jews had long been driven out, and nobody in his right mind would dream of letting any Muslims in. And yet, the Scientific Revolution began in London and Paris rather than in Cairo and Istanbul.

  It is customary to portray the history of modernity as a struggle between science and religion. In theory, both science and religion are interested above all in the truth, and because each upholds a different truth, they are doomed to clash. In fact, neither science nor religion cares that much about the truth, hence they can easily compromise, coexist and even cooperate.

  Religion is interested above all in order. It aims to create and maintain the social structure. Science is interested above all in power. Through research, it aims to acquire the power to cure diseases, fight wars and produce food. As individuals, scientists and priests may give immense importance to the truth; but as collective institutions, science and religion prefer order and power over truth. They therefore make good bedfellows. The uncompromising quest for truth is a spiritual journey, which can seldom remain within the confines of either religious or scientific establishments.

  It would accordingly be far more accurate to view modern history as the process of formulating a deal between science and one particular religion – namely, humanism. Modern society believes in humanist dogmas, and uses science not in order to question these dogmas, but rather in order to implement them. In the twenty-first century the humanist dogmas are unlikely to be replaced by pure scientific theories. However, the covenant linking science and humanism may well crumble and give way to a very different kind of deal, between science and some new post-humanist religion. We will dedicate the next two chapters to understanding the modern covenant between science and humanism. The third and final part of the book will then explain why this covenant is disintegrating, and what new deal might replace it.

  6

  The Modern Covenant

  Modernity is a deal. All of us sign up to this deal on the day we are born, and it regulates our lives until the day we die. Very few of us can ever rescind or transcend this deal. It shapes our food, our jobs and our dreams, and it decides where we dwell, whom we love and how we pass away.

  At first sight modernity looks like an extremely complicated deal, hence few try to understand what they have signed up for. Like when you download some software and are asked to sign an accompanying contract that consists of dozens of pages of legalese—you take one look at it, immediately scroll down to the last page, tick ‘I agree’ and forget about it. Yet in fact modernity is a surprisingly simple deal. The entire contract can be summarised in a single phrase: humans agree to give up meaning in exchange for power.

  Until modern times most cultures believed that humans played a part in some great cosmic plan. The plan was devised by the omnipotent gods, or by the eternal laws of nature, and humankind could not change it. The cosmic plan gave meaning to human life, but also restricted human power. Humans were much like actors on a stage. The script gave meaning to their every word, tear and gesture – but placed strict limits on their performance. Hamlet cannot murder Claudius in Act I, or leave Denmark and go to an ashram in India. Shakespeare won’t allow it. Similarly, humans cannot live for ever, they cannot escape all diseases, and they cannot do as they please. It’s not in the script.

  In exchange for giving up power, premodern humans believed that their lives gained meaning. It really mattered whether they fought bravely on the battlefield, w
hether they supported the lawful king, whether they ate forbidden foods for breakfast or whether they had an affair with the next-door neighbour. This of course created some inconveniences, but it gave humans psychological protection against disasters. If something terrible happened – such as war, plague or drought – people consoled themselves that ‘We all play a role in some great cosmic drama devised by the gods, or by the laws of nature. We are not privy to the script, but we can rest assured that everything happens for a purpose. Even this terrible war, plague and drought have their place in the greater scheme of things. Furthermore, we can count on the playwright that the story surely has a good and meaningful ending. So even the war, plague and drought will work out for the best – if not here and now, then in the afterlife.’

  Modern culture rejects this belief in a great cosmic plan. We are not actors in any larger-than-life drama. Life has no script, no playwright, no director, no producer – and no meaning. To the best of our scientific understanding, the universe is a blind and purposeless process, full of sound and fury but signifying nothing. During our infinitesimally brief stay on our tiny speck of a planet, we fret and strut this way and that, and then are heard of no more.

  Since there is no script, and since humans fulfil no role in any great drama, terrible things might befall us and no power will come to save us or give meaning to our suffering. There won’t be a happy ending, or a bad ending, or any ending at all. Things just happen, one after the other. The modern world does not believe in purpose, only in cause. If modernity has a motto, it is ‘shit happens’.

  On the other hand, if shit just happens, without any binding script or purpose, then humans too are not confined to any predetermined role. We can do anything we want – provided we can find a way. We are constrained by nothing except our own ignorance. Plagues and droughts have no cosmic meaning – but we can eradicate them. Wars are not a necessary evil on the way to a better future – but we can make peace. No paradise awaits us after death – but we can create paradise here on earth and live in it for ever, if we just manage to overcome some technical difficulties.

  If we invest money in research, then scientific breakthroughs will accelerate technological progress. New technologies will fuel economic growth, and a growing economy will dedicate even more money to research. With each passing decade we will enjoy more food, faster vehicles and better medicines. One day our knowledge will be so vast and our technology so advanced that we shall distil the elixir of eternal youth, the elixir of true happiness, and any other drug we might possibly desire – and no god will stop us.

  The modern deal thus offers humans an enormous temptation, coupled with a colossal threat. Omnipotence is in front of us, almost within our reach, but below us yawns the abyss of complete nothingness. On the practical level modern life consists of a constant pursuit of power within a universe devoid of meaning. Modern culture is the most powerful in history, and it is ceaselessly researching, inventing, discovering and growing. At the same time, it is plagued by more existential angst than any previous culture.

  This chapter discusses the modern pursuit of power. The next chapter will examine how humankind has used its growing power to somehow sneak meaning back into the infinite emptiness of the cosmos. Yes, we moderns have promised to renounce meaning in exchange for power; but there’s nobody out there to hold us to our promise. We think we are smart enough to enjoy the full benefits of the modern deal, without having to pay its price.

  Why Bankers are Different from Vampires

  The modern pursuit of power is fuelled by the alliance between scientific progress and economic growth. For most of history science progressed at a snail’s pace, while the economy was in deep freeze. The gradual increase in human population did lead to a corresponding increase in production, and sporadic discoveries sometimes resulted even in per capita growth, but this was a very slow process.

  If in AD 1000 a hundred villagers produced a hundred tons of wheat, and in AD 1100, 105 villagers produced 107 tons of wheat, this nominal growth didn’t change the rhythms of life nor the socio-political order. Whereas today everyone is obsessed with growth, in the premodern era people were oblivious to it. Princes, priests and peasants assumed that human production was more or less stable, that one person could enrich himself only by pilfering from another and that their grandchildren were unlikely to enjoy a better standard of living.

  This stagnation resulted to a large extent from the difficulties involved in financing new projects. Without adequate funding, it wasn’t easy to drain swamps, construct bridges and build ports – not to mention engineer new wheat strains, discover new energy sources or open new trade routes. Funds were scarce because there was little credit in those days; there was little credit because people had no belief in growth; and people didn’t believe in growth because the economy was stagnant. Stagnation thereby perpetuated itself.

  Suppose you live in a medieval town that suffers from annual outbreaks of dysentery. You resolve to find a cure. You need funding to set up a workshop, buy medicinal herbs and exotic chemicals, pay assistants and travel to consult with famous doctors. You also need money to feed yourself and your family while you are busy with your research. But you don’t have much money. You can approach the local miller, baker and blacksmith and ask them to meet all your needs for a few years, promising that when you finally discover the cure and become wealthy, you will pay your debts.

  Unfortunately, the miller, baker and blacksmith are unlikely to consent. They need to feed their families today, and they have no faith in miracle medicines. They weren’t born yesterday, and in all their years they have never heard of anyone finding a new medicine for some dreaded disease. If you want provisions – you have to pay cash. But how can you get the money when you haven’t discovered the medicine yet, and all your time is taken up with research? Reluctantly, you go back to tilling your field, dysentery keeps tormenting the townsfolk, nobody tries to develop new remedies, and not a single gold coin changes hands. That’s how the economy languished and science stood still.

  The cycle was eventually broken in the modern age thanks to people’s growing trust in the future, and the resulting miracle of credit. Credit is the economic manifestation of trust. Nowadays, if I want to develop a new drug but I don’t have enough money, I can get a loan from a bank, or turn to private investors and venture capital funds. When Ebola erupted in West Africa in the summer of 2014, what do you think happened to the shares of pharmaceutical companies that were busy developing anti-Ebola drugs and vaccines? They skyrocketed. Tekmira shares rose by 50 per cent and BioCryst shares by 90 per cent. In the Middle Ages, the outbreak of a plague caused people to raise their eyes towards heaven, and pray to God to forgive them for their sins. Today when people hear of some deadly new epidemic, they reach for their mobile phones and call their brokers. For the stock exchange, even an epidemic is a business opportunity.

  If enough new ventures succeed, people’s trust in the future increases, credit expands, interest rates fall, entrepreneurs can raise money more easily and the economy grows. People consequently have even greater trust in the future, the economy keeps growing and science progresses with it.

  It sounds simple on paper. Why then did humankind have to wait until the modern era for economic growth to gather momentum? For thousands of years people had little faith in future growth not because they were stupid, but because it contradicts our gut feelings, our evolutionary heritage and the way the world works. Most natural systems exist in equilibrium, and most survival struggles are a zero-sum game in which one can prosper only at the expense of another.

  For example, each year roughly the same amount of grass grows in a given valley. The grass supports a population of 10,000 rabbits or so, which contains enough slow, dim-witted or unlucky rabbits to provide prey for a hundred foxes. If one fox is particularly clever and diligent, and devours more rabbits than average, then other foxes will likely starve. If all foxes somehow manage to catch more rabbits simultaneously,
the rabbit population will crash, and next year even more foxes will starve. Even though there are occasional fluctuations in the rabbit market, in the long run the foxes cannot expect to hunt, say, 3 per cent more rabbits per year than the preceding year.

  Of course, some ecological realities are more complex, and not all survival struggles are zero-sum games. Many animals cooperate effectively, and a few even give loans. The most famous lenders in nature are vampire bats. These bats congregate in the thousands inside caves, and every night fly out to look for prey. When they find a sleeping bird or careless mammal, they make a small incision in its skin, and suck its blood. But not all vampire bats find a victim every night. In order to cope with the uncertainty of their life, the vampires loan blood to each other. A vampire that fails to find prey will come home and ask a more fortunate friend to regurgitate some stolen blood. Vampires remember very well to whom they loaned blood, so at a later date if the friend returns home hungry, he will approach his debtor, who will reciprocate the favour.

  However, unlike human bankers, vampires never charge interest. If vampire A loaned vampire B ten centilitres of blood, B will repay the same amount. Nor do vampires use loans in order to finance new businesses or encourage growth in the blood-sucking market. Because the blood is produced by other animals, the vampires have no way of increasing production. Though the blood market has its ups and downs, vampires cannot presume that in 2017 there will be 3 per cent more blood than in 2016, and that in 2018 the blood market will again grow by 3 per cent. Consequently, vampires don’t believe in growth.1 For millions of years of evolution humans lived under conditions similar to those of vampires, foxes and rabbits. Hence humans too find it difficult to believe in growth.

  The Miracle Pie