Physics of the Future

by Michio Kaku

  The lesson of Singapore is not for everyone. It is a small city-state, where a handful of visionaries could practice controlled nation building. And not everyone wants to be whipped for spitting on the street. However, it shows you what you can do if you systematically want to leap to the front of the information revolution.

  CHALLENGE FOR THE FUTURE

  I once spent some time at the Institute for Advanced Study at Princeton, and had lunch with Freeman Dyson. He began to reminisce about his long career in science and then mentioned a disturbing fact. Before the war, when he was a young university student in the UK, he found that the brightest minds of England were turning their backs on the hard sciences, like physics and chemistry, in favor of lucrative careers in finance and banking. While the previous generation was creating wealth, in the form of electrical and chemical plants and inventing new electromechanical machines, the next generation was indulging in massaging and managing other people’s money. He lamented that it was a sign of the decline of the British Empire. England could not maintain its status as a world power if it had a crumbling scientific base.

  Then he said something that caught my attention.

  He remarked that he was seeing this for the second time in his life. The brightest minds at Princeton were no longer tackling the difficult problems in physics and mathematics but were being drawn into careers like investment banking. Again, he thought, this might be a sign of decay, when the leaders of a society can no longer support the inventions and technology that made their society great.

  This is our challenge for the future.

  People alive now are living in the midst of what may be seen as the most extraordinary three or four centuries in human history.

  —JULIAN SIMON

  Where there is no vision, the people perish.

  —PROVERBS 29:18

  In mythology, the gods lived in the divine splendor of heaven, far above the insignificant affairs of mere mortals. The Greek gods frolicked in the heavenly domain of Mount Olympus, while the Norse gods who fought for honor and eternal glory would feast in the hallowed halls of Valhalla with the spirits of fallen warriors. But if our destiny is to attain the power of the gods by the end of the century, what will our civilization look like in 2100? Where is all this technological innovation taking our civilization?

  All the technological revolutions described here are leading to a single point: the creation of a planetary civilization. This transition is perhaps the greatest in human history. In fact, the people living today are the most important ever to walk the surface of the planet, since they will determine whether we attain this goal or descend into chaos. Perhaps 5,000 generations of humans have walked the surface of the earth since we first emerged in Africa about 100,000 years ago, and of them, the ones living in this century will ultimately determine our fate.

  Unless there is a natural catastrophe or some calamitous act of folly, it is inevitable that we will enter this phase of our collective history. We can see this most clearly by analyzing the history of energy.

  RANKING CIVILIZATIONS

  When professional historians write history, they view it through the lens of human experience and folly, that is, through the exploits of kings and queens, the rise of social movements, and the proliferation of ideas. Physicists, by contrast, view history quite differently.

  Physicists rank everything, even human civilizations, by the energy it consumes. When applied to human history, we see that for countless millennia, our energy was limited to 1/5 horsepower, the power of our bare hands, and hence we lived nomadic lives in small, wandering tribes, scavenging for food in a harsh, hostile environment. For eons, we were indistinguishable from the wolves. There were no written records, just stories handed down from generation to generation at lonely campfires. Life was short and brutish, with an average life expectancy of eighteen to twenty years. Your total wealth consisted of whatever you could carry on your back. Most of your life, you felt the gnawing pain of hunger. After you died, you left no trace that you had ever lived at all.

  But 10,000 years ago, a marvelous event happened that set civilization into motion: the Ice Age ended. For reasons that we still do not understand, thousands of years of glaciation ended. This paved the way for the rise of agriculture. Horses and oxen were soon domesticated, which increased our energy to 1 horsepower. Now one person had the energy to harvest several acres of farmland, yielding enough surplus energy to support a rapidly expanding population. With the domestication of animals, humans no longer relied primarily on hunting animals for food, and the first stable villages and cities began to rise from the forests and plains.

  The excess wealth created by the agricultural revolution spawned new, ingenious ways to maintain and expand this wealth. Mathematics and writing were created to count this wealth, calendars were needed to keep track of when to plant and harvest, and scribes and accountants were needed to keep track of this surplus and tax it. This excess wealth eventually led to the rise of large armies, kingdoms, empires, slavery, and ancient civilizations.

  The next revolution took place about 300 years ago, with the coming of the Industrial Revolution. Suddenly, the wealth accumulated by an individual was not just the product of his hands and horse but the product of machines that could create fabulous wealth via mass production.

  Steam engines could drive powerful machines and locomotives, so that wealth could be created from factories, mills, and mines, not just fields. Peasants, fleeing from periodic famines and tired of backbreaking work in the fields, flocked to the cities, creating the industrial working class. Blacksmiths and wagonmakers were eventually replaced by autoworkers. With the coming of the internal combustion engine, a person could now command hundreds of horsepower. Life expectancy began to grow, hitting forty-nine in the United States by the year 1900.

  Finally, we are in the third wave, where wealth is generated from information. The wealth of nations is now measured by electrons circulating around the world on fiber-optic cables and satellites, eventually dancing across computer screens on Wall Street and other financial capitals. Science, commerce, and entertainment travel at the speed of light, giving us limitless information anytime, anywhere.

  TYPE I, II, AND III CIVILIZATIONS

  How will this exponential rise in energy continue into the coming centuries and millennia? When physicists try to analyze civilizations, we rank them on the basis of the energy they consume. This ranking was first introduced in 1964 by Russian astrophysicist Nikolai Kardashev, who was interested in probing the night sky for signals sent from advanced civilizations in space.

  He was not satisfied with something as nebulous and ill defined as an “extraterrestrial civilization,” so he introduced a quantitative scale to guide the work of astronomers. He realized that extraterrestrial civilizations may differ on the basis of their culture, society, government, etc., but there was one thing they all had to obey: the laws of physics. And from the earth, there was one thing that we could observe and measure that could classify these civilizations into different categories: their consumption of energy.

  So he proposed three theoretical types: A Type I civilization is planetary, consuming the sliver of sunlight that falls on their planet, or about 1017 watts. A Type II civilization is stellar, consuming all the energy that their sun emits, or 1027 watts. A Type III civilization is galactic, consuming the energy of billions of stars, or about 1037 watts.

  The advantage of this classification is that we can quantify the power of each civilization rather than make vague and wild generalizations. Since we know the power output of these celestial objects, we can put specific numerical constraints on each of them as we scan the skies.

  Each type is separated by a factor of 10 billion: a Type III civilization consumes 10 billion times more energy than a Type II civilization (because there are roughly 10 billion or more stars in a galaxy), which in turn consumes 10 billion times more energy than a Type I civilization.

  According to this classification, o
ur present-day civilization is Type 0. We don’t even rate on this scale, since we get our energy from dead plants, that is, from oil and coal. (Carl Sagan, generalizing this classification, tried to get a more precise estimate of where we ranked on this cosmic scale. His calculation showed that we are actually a Type .7 civilization.)

  On this scale, we can also classify the various civilizations we see in science fiction. A typical Type I civilization would be that of Buck Rogers or Flash Gordon, where an entire planet’s energy resources have been developed. They can control all planetary sources of energy, so they might be able to control or modify the weather at will, harness the power of a hurricane, or have cities on the oceans. Although they roam the heavens in rockets, their energy output is still largely confined to a planet.

  A Type II civilization might include Star Trek’s United Federation of Planets (without the warp drive), able to colonize about 100 nearby stars. Their technology is barely capable of manipulating the entire energy output of a star.

  A Type III civilization may be the Empire in the Star Wars saga, or perhaps the Borg in the Star Trek series, both of which have colonized large portions of a galaxy, embracing billions of star systems. They can roam the galactic space lanes at will.

  (Although the Kardashev scale is based on planets, stars, and galaxies for its classification, we should point out the possibility of a Type IV civilization, which derives its energy from extragalactic sources. The only known energy source beyond our galaxy is dark energy, which makes up 73 percent of the matter and energy of the known universe, while the world of stars and galaxies makes up only 4 percent of the universe. A possible candidate for a Type IV civilization might be the godlike Q in the Star Trek series, whose power is extragalactic.)

  We can use this classification to calculate when we might achieve each of these types. Assume that world civilization grows at the rate of 1 percent each year in terms of its collective GDP. This is a reasonable assumption when we average over the past several centuries. According to this assumption, it takes roughly 2,500 years to go from one civilization to the next. A 2 percent growth rate would give a transition period of 1,200 years.

  But we can also calculate how long it would take for our planet to attain Type I classification. In spite of economic recessions and expansions, booms and busts, we can mathematically estimate that we will attain Type I status in about 100 years, given an average rate of our economic growth.

  FROM TYPE O TO TYPE I

  We see evidence of this transition from Type 0 to Type I every time we open a newspaper. Many of the headlines can be traced to the birth pangs of a Type I civilization being born right in front of our eyes.

  • The Internet is the beginning of a Type I planetary telephone system. For the first time in history, a person on one continent can effortlessly exchange unlimited information with someone on another continent. In fact, many people already feel they have more in common with someone on the other side of the world than with their next-door neighbor. This process will only accelerate as nations lay even more fiber-optic cables and launch more communications satellites. This process is also unstoppable. Even if the president of the United States tried to ban the Internet, he would be met only with laughter. There are almost a billion personal computers in the world today, and roughly a quarter of humanity has been on the Internet at least once.

  • A handful of languages, led by English, followed by Chinese, are rapidly emerging as the future Type I language. On the World Wide Web, for example, 29 percent of visitors log on in English, followed by 22 percent in Chinese, 8 percent in Spanish, 6 percent in Japanese, and 5 percent in French. English is already the de facto planetary language of science, finance, business, and entertainment. English is the number-one second language on the planet. No matter where I travel, I find that English has emerged as the lingua franca. In Asia, for example, when Vietnamese, Japanese, and Chinese are in a meeting, they use English to communicate. Currently, there are about 6,000 languages being spoken on earth, and 90 percent of them are expected to become extinct in the coming decades, according to Michael E. Krauss, formerly of the University of Alaska’s Native Language Center. The telecommunications revolution is accelerating this process, as people living in even the most remote regions of the earth are exposed to English. This will also accelerate economic development as their societies are further integrated into the world economy, thereby raising living standards and economic activity.

  Some people will bemoan the fact that some ancestral languages will no longer be spoken. But on the other hand, the computer revolution will guarantee that these languages are not lost. Native speakers will add their language and their culture to the Internet, where they will last forever.

  • We are witnessing the birth of a planetary economy. The rise of the European Union and other trade blocs represents the emergence of a Type I economy. Historically, the peoples of Europe have fought blood feuds with their neighbors for thousands of years. Even after the fall of the Roman Empire, these tribes would continue to slaughter one another, eventually becoming the feuding nations of Europe. Yet today, these bitter rivals have suddenly banded together to form the European Union, representing the largest concentration of wealth on the planet. The reason these nations have abruptly put aside their famous rivalries is to compete with the economic juggernaut of nations that signed the North American Free Trade Agreement (NAFTA). In the future, we will see more economic blocs forming, as nations realize that they cannot remain competitive unless they join lucrative trading blocs.

  We see graphic evidence of this when analyzing the great recession of 2008. Within a matter of days, the shock waves emanating from Wall Street rippled through the financial halls of London, Tokyo, Hong Kong, and Singapore. Today, it is impossible to understand the economics of a single nation without understanding the trends affecting the world economy.

  • We are seeing the rise of a planetary middle class. Hundreds of millions of people in China, India, and elsewhere are entering its ranks, which is perhaps the greatest social upheaval in the last half century. This group is savvy about cultural, educational, and economic trends affecting the planet. The focus of this planetary middle class is not wars, religion, or strict moral codes, but political and social stability and consumer goods. The ideological and tribal passions that might have gripped their ancestors mean little to them if their goal is to have a suburban house with two cars. While their ancestors might have celebrated the day their sons went off to war, one of their main concerns now is to get them into a good college. And for people who enviously watch other people rise, they will wonder when their time will come. Kenichi Ohmae, a former senior partner of McKinsey & Company, writes, “People will inevitably start to look around them and ask why they cannot have what others have. Equally important, they will start to ask why they were not able to have it in the past.”

  • The economy, not weapons, is the new criterion for a superpower. The rise of the EU and NAFTA underscores an important point: with the end of the Cold War, it is clear that a world power can maintain its dominant position mainly through economic might. Nuclear wars are simply too dangerous to fight, so it is economic might that will largely determine the destiny of nations. One contributing factor to the collapse of the Soviet Union was the economic stress of competing militarily with the United States. (As the advisers to President Ronald Reagan once commented, the strategy of the United States was to spend Russia into a depression, that is, increase U.S. military expenditure so that the Russians, with an economy less than half the size of the United States’, would have to starve their own people to keep up.) In the future, it is clear that a superpower can maintain its status only through economic might, and that in turn stems from science and technology.

  • A planetary culture is emerging, based on youth culture (rock and roll and youth fashion), movies (Hollywood blockbusters), high fashion (luxury goods), and food (mass-market fast-food chains). No matter where you travel, you can find evidence
of the same cultural trends in music, art, and fashion. For example, Hollywood carefully factors in global appeal when it estimates the success of a potential blockbuster movie. Movies with cross-cultural themes (such as action or romance), packed with internationally recognized celebrities, are the big moneymakers for Hollywood, evidence of an emerging planetary culture.

  We saw this after World War II when, for the first time in human history, an entire generation of young people possessed enough disposable income to alter the prevailing culture. Formerly, children were sent into the fields to toil with their parents once they hit puberty. (This is the origin of the three-month summer vacation. During the Middle Ages, children were required to do backbreaking work in the fields during summer as soon as they were of age.) But with rising prosperity, the postwar baby boom generation left the fields to head to the streets. Today, we see the same pattern taking place in country after country, as economic development empowers youth with ample disposable incomes. Eventually, as most of the people of the world enter the middle class, rising incomes will filter down to their youth, fueling a perpetuation of this planetary youth culture.