第 1 章
Our World in Motion: The Great Climate Migration
In the coming decades, our planet will undergo a transformation unlike anything in human history. By 2070, extreme heat and humidity will render vast regions uninhabitable for 3.5 billion people, triggering the largest human migration ever recorded. This isn't speculative fiction-it's already happening. Gaia Vince's "Nomad Century" offers a stark yet ultimately hopeful roadmap for this unprecedented planetary upheaval.
The book has garnered attention from climate scientists, policy experts, and even celebrities like Leonardo DiCaprio, who called it "essential reading for understanding our future." Time Magazine named it one of 2022's most important climate books, while The Guardian praised it as "visionary and deeply humane." What makes Vince's work particularly compelling is her background as both a science journalist and environmental activist who has witnessed firsthand the early stages of climate migration across multiple continents.
At its core, "Nomad Century" argues something revolutionary yet deeply rooted in our evolutionary history: mass migration isn't just inevitable-it's our most powerful adaptation strategy. Rather than futilely resisting this reality, Vince suggests we must embrace and plan for it, transforming our societies, economies, and even our concept of national identity to accommodate billions of climate refugees in a warming world.
第 2 章
The Gathering Storm: Our Planet Under Pressure
We face environmental catastrophe on an unprecedented scale: drowned cities, biodiversity collapse, intolerable heat, and widespread hunger-all while our population approaches 10 billion. The world is heating rapidly, with temperatures projected to rise 3-4C within decades. This isn't a distant threat; it's unfolding now.
The Greenland ice sheet is approaching a tipping point of accelerated melting. At least 28 trillion tonnes of land ice have vanished in just twenty-five years. Sea levels will rise at least two meters by 2100, with eventual rises of at least 10 meters as ice sheets collapse. A wide equatorial belt of high humidity will create intolerable heat stress across tropical regions, while expanding deserts will stretch from the Sahara through southern Europe.
What does this mean for humanity? A hostile world with soaring food prices, water scarcity, and up to 2 billion climate refugees by century's end. The Amazon may transform to grassland as easterly trade winds weaken. These aren't worst-case scenarios-they're middle-of-the-road projections based on current warming trends.
What makes this crisis particularly insidious is how climate change multiplies other problems. Fire, heat, drought, and flood-the four horsemen of the Anthropocene-will transform our world, making much of it unlivable for humans.
Consider heat, more deadly than fire despite its less dramatic appearance. The world now experiences twice as many days over 50C than thirty years ago. By 2070, one in three people could experience annual average temperatures exceeding 29C-conditions currently found only in desert settlements. When combined with humidity, heat becomes especially lethal as sweat can't evaporate to cool the body. At wet-bulb temperatures above 35C, even fit people die within hours-a threshold already briefly crossed in places along the Persian Gulf and in river valleys of India and Pakistan.
By century's end, simply going outside for a few hours in parts of India and eastern China "will result in death even for the fittest humans." The tropical belt will expand thousands of kilometers, making cities like London feel like Barcelona and Moscow like Sofia.
第 3 章
Migration: Our Evolutionary Solution
Migration is our evolutionary response to crisis and opportunity, deeply embedded in human DNA. Though modern borders and national identities make migration seem abnormal today, historically these constraints are a recent anomaly spanning just a few centuries. Migration has fundamentally transformed our globe through exploration, disaster response, opportunity-seeking, and trade, shaping everything from genetic diversity to cultural exchange.
For humans, migration is uniquely interwoven with cooperation and social learning. Our collaborative abilities not only enable migration but amplify its benefits through knowledge sharing and resource pooling. While many species evolved innate migratory responses to seasonal variations - like birds following set routes or wildebeest tracking rainfall patterns - humans retain a distinctive cognitive restlessness. This manifests as both practical relocation and recreational travel, from ancient pilgrimages to modern tourism.
Our ancestors gained the remarkable ability to live anywhere on Earth by sacrificing niche-specific adaptations - a risky evolutionary strategy for such resource-demanding creatures. Unlike specialized species adapted to specific environments, humans evolved as generalists. This was only possible through our highly adaptive brains and hypersocial cooperation, allowing us to both modify environments through tool use and technology, and adapt ourselves through learned skills, behaviors, and cultural practices.
What truly set humans apart was our unprecedented ability to migrate not just ourselves but resources and information across vast networks. By creating social networks strong enough for resource exchange - evidenced by archaeological findings of trade goods like obsidian and shells hundreds of miles from their sources - our ancestors could migrate further and longer than any other species. These networks eventually enabled the colonization of continents beyond Africa, possibly giving our species the crucial edge over extinct human relatives like Neanderthals, who never ventured beyond Eurasia's boundaries.
The agricultural revolution around 12,000 years ago fundamentally altered human migration patterns and social organization. Once invested in crops and permanent settlements, people needed to remain in place to harvest benefits, fundamentally tying identity to land ownership. Despite significant health disadvantages - archaeological evidence shows rapid population growth accompanied by increased bone infections, dental problems, and nutritional deficiencies from restricted starch-based diets - agriculture efficiently used land for food production. The sedentary lifestyle allowed women to have more frequent pregnancies, dramatically expanding human populations and creating new patterns of dispersal as growing families required more land and resources.
Human migration has distributed not only our genes but also cultural practices, technologies, and innovations globally. Unlike our closest relatives, chimpanzees, who typically attack intruders, humans developed sophisticated social norms welcoming strangers, with hospitality becoming a mark of cultural prestige and social status. Our extended families often span group boundaries through marriage and alliance-building, creating networks of relatedness that facilitate cooperation rather than hostility. This unique combination of mobility and sociality enabled humans to develop the most extensive geographic range of any mammal species, adapting to environments from Arctic tundra to tropical rainforests.
第 4 章
Bordering on Insanity: The Paradox of Modern Migration
In just 200 years, our population exploded from 1 billion to nearly 8 billion-an evolutionary success largely due to migration. Yet we're not evenly distributed; some areas like Bangladesh (1,252 people per square kilometer) are densely populated while others like Australia (3 people per square kilometer) remain sparse.
Climate change is shifting our habitable zones poleward at 115 centimeters daily, requiring species to migrate at 0.42 kilometers yearly to maintain their climate conditions. Though relocation could solve many problems for vulnerable populations and benefit both host and origin nations economically, borders present enormous barriers.
While 14% of the global population were international migrants in the late nineteenth century, today only 3% are-yet they contribute 10% of global GDP. Economists calculate removing borders could increase global GDP by 100-150%, adding at least $90 trillion annually.
Anti-immigration arguments often rest on notions of "pure" national identity that determine who "belongs." This tribal thinking has evolutionary roots-humans evolved to prove loyalty to their group through shared social norms. Our out-group prejudice develops in early childhood. People empathize with members of their in-group but stop when told someone belongs to an out-group.
Surprisingly, border control to keep foreigners out is a recent phenomenon. Historically, states worried more about preventing people from leaving than arriving, as they needed labor and taxes. Passports originally were letters requesting safe passage, not entry restrictions. Individual nationality had little political meaning before the late eighteenth century.
Human societies evolved from small bands limited by Dunbar's number (about 150 meaningful relationships) to complex hierarchies. However, these were not nation states-rulers focused on warfare rather than governance, and people identified "vertically" by their rulers rather than horizontally with fellow citizens.
Only with industrialization and revolutions did modern nation states emerge, defined by national identity. In 1800, barely anyone in France considered themselves French; by 1900, everyone did. Most nation states we now consider permanent were created when global population was just a quarter of today's.
Nationalism depends less on flags and anthems than on effective bureaucracy. As industrial societies grew more complex, expanded government services required systems to determine eligibility, leading to citizenship papers and controlled borders. Nation states are artificial constructs built on the myth that the world consists of distinct, homogeneous groups occupying separate territories.
第 5 章
The Economic Case for Migration
Migrants improve economies both in destination countries and in their countries of origin. They forge networks that facilitate technology transfer, trade, investment, and institutional norms that foster growth. The Philippines has developed expertise in training specialist nurses for global demand, which has spurred a 3.5% increase in secondary school enrollment in migrants' home communities and raised overall income levels.
Opening borders to migration would dramatically increase global prosperity-potentially doubling global GDP. Contrary to popular fears, immigrants don't take jobs from natives or drive down wages; they diversify workforce skills, increase economic efficiency, and create new jobs through their spending and taxes.
US counties that received more immigrants between 1860-1920 showed 57% higher manufacturing output by 1930 and 20% higher average incomes even in 2000, demonstrating migration's long-lasting economic benefits. Studies consistently show that even large waves of low-skilled migrants have no negative impact on native wages or employment.
Migrants actually increase jobs by spending money locally, slowing automation adoption, and triggering beneficial labor market reorganization where natives move to higher-paying communication-based roles. Immigrant entrepreneurs create businesses that employ both migrants and natives, with immigrant-founded companies accounting for more than half of America's top firms including Google, Yahoo!, and Tesla.
Global fertility rates have plummeted from 4.7 children per woman in 1950 to 2.4 in 2020, with dramatic variations between countries. Europe faces a demographic catastrophe-its population will shrink 10% by 2050, with workers being outnumbered by dependents by one-fifth by 2060. Germany alone needs 500,000 migrants annually just to maintain stability.
Nearly two dozen countries are already shrinking yearly, from Poland to Japan, which could collapse from 128 million people to just 53 million by 2100. The solution is obvious but rarely discussed: facilitate migration from regions with surplus young populations to aging societies with labor shortages.
第 6 章
Building a New Cosmopolitan World
Mass migration is inevitable, whether we're prepared or not. The dominant narrative has centered on the threat of foreigners overwhelming us, rather than opportunities and realities of human movement. We need to change this narrative.
Rich nations harbor massive misconceptions about migration. People overestimate immigrant populations and believe racist tropes about migrants being criminals, poor, uneducated, and welfare-dependent. In reality, most migrants move for work opportunities, not benefits, with Christians comprising half of all migrants worldwide. Immigrants typically pay as much in taxes as they receive in benefits and commit fewer crimes than native-born citizens.
Managing this transition requires addressing legitimate concerns about pressure on housing, schools, healthcare and other services through careful planning and adequate investment. While diversity increases innovation and productivity, it requires mental energy and adjustment. Free language classes and mentoring for new arrivals can ease this transition.
Despite fears, research across 145 countries shows migration typically reduces terrorism rather than increases it, primarily because it boosts economic growth. Well-settled immigrants who can work are unlikely to become extremists, though native communities whose migration fears go unaddressed may produce their own extremists.
Successful integration requires balance-allowing migrants some clustering for social network benefits while preventing segregation through dispersed public housing that ensures no exclusively rich or native-only neighborhoods exist. Cultural change is inevitable but enriching-migration triggers creativity, multiplying music, cuisine, and languages. This isn't replacement but fusion, where traditions blend.
Our post-war institutions were built for an international world dominated by Western nations, but now we need a truly global approach. The climate crisis offers an opportunity to disrupt geographic inequity by recognizing all migrants as global citizens.
Only strong nation states can manage massive migration influxes while maintaining social cohesion. We must reinvent the nation state to be inclusive and not based on ancestry or skin color. Patriotism matters as a source of identity-we could build it around protecting our nation's air, land and water. National service for young citizens and immigrants could create solidarity through disaster relief and nature restoration.
第 7 章
Haven Earth: Redesigning Our Planetary Home
Migration will remake our world this century, and we must develop a radical plan for humanity to survive a 3-4C hotter world. We need to cooperate as never before, planning population centers around freshwater resources, safe temperatures, and renewable energy potential rather than current political boundaries.
North of the 45N parallel will become the century's booming haven, representing 15% of the planet's area but 29% of ice-free land. This region is entering the optimum climate for human productivity with mean temperatures around 13C.
The Great Lakes region will see a massive influx of migrants. Cities like Duluth, Minneapolis and Madison will be desirable destinations, while more southerly Midwestern cities face extreme heat threats. Alaska appears to be the best future location in the United States, with Kodiak Island ranked at lowest climate risk. By 2047, Alaska could experience temperatures similar to today's Florida.
Canada, Siberia, Russia, Iceland, Nordic nations and Scotland will all benefit from global heating, as predicted by Swedish chemist Svante Arrhenius over a century ago. Arctic vegetation productivity will nearly double by the 2080s. Global warming has already boosted Sweden's GDP by 25%, while harming tropical economies-India's GDP has lagged by 31%, Nigeria's by 29%, Indonesia's by 27%, and Brazil's by 25%.
Russia stands to gain significantly from climate change, potentially seeing 4.2 million square kilometers of newly arable farmland. By 2080, more than half of Siberia's permafrost will have thawed, transforming "absolute extreme" territories to "fairly favorable" for civilization.
Human migration requires more than just finding suitable locations-we're constrained by complex social structures that animals and our nomadic ancestors weren't. Successfully relocating hundreds of millions of climate migrants may require international land purchases with compensation, new forms of citizenship, "caretaker states" managing vulnerable regions, charter cities, or regional geopolitical consolidation.
Charter cities offer another governance model for climate migration-territories operating under different rules than their surrounding jurisdiction. A viable approach might involve vulnerable nations like Nigeria, Bangladesh or Maldives purchasing or renting land within larger countries like Canada, Russia or Greenland for 99-year periods.
第 8 章
Designing Migrant Cities for the Future
In 2008, humanity crossed a threshold-more people lived in cities than rural areas for the first time in our evolutionary history. The most successful migrant cities are dense but not too high, featuring 4-6 story blocks with street access, clustered near essential services with excellent transport links.
Universal access to healthcare and education is crucial regardless of origin or wealth. While density matters for housing efficiency, we must avoid the failed concrete desert high-rises of European capitals. Instead, cities need mixed high and low-rise buildings with integrated business, retail and public spaces to foster networking opportunities and social capital.
Government investment in migration is repaid through a new tax-paying labor force. Canada's successful community sponsorship model, where private organizations cover costs for humanitarian migrants, has welcomed over 300,000 refugees with 70% finding employment within their first year compared to just 40% of government-assisted refugees.
Spain offers a remarkable case study in migration management. From 2000-2009, Spain's foreign-born population quadrupled to 14% without significant anti-migrant backlash. Their comprehensive approach included making employed undocumented migrants legal taxpaying residents, establishing work permit programs to deter dangerous crossings, and investing 2 billion in education, housing, employment assistance and social services.
Housing affordability remains a critical barrier to migration. Restrictive zoning laws prevent higher-density housing in well-connected areas where it's most needed. Successful migrant cities require "intensity"-mixed-use neighborhoods where residential, commercial and light industrial uses coexist, creating vibrant, opportunity-rich environments like in Hong Kong, Manhattan and Paris.
Cities must adapt to accommodate millions of newcomers while ensuring environmental resilience, resource efficiency and pollution elimination. The primary risks cities face are extreme weather events. Cities worldwide are implementing innovative solutions: rain gardens in London and New Orleans, China's "sponge cities" like Wuhan with marsh zones and underground storage tanks, Barcelona's water-absorbing road surfaces, and Gothenburg's "rain playground."
Heat management is becoming critical, with cooling already consuming 20% of global energy and expected to triple by 2050. Solutions include strategic water features (Athens' Omonia Square fountain reduces temperatures by 4C), rooftop gardens (Chicago's city hall stays 45C cooler than uncovered areas), and white-painted surfaces (which can reduce indoor temperatures by 7C and save 40% on air conditioning costs).
第 9 章
Restoration: Healing Our Planet
The mass migration we face occurs amid an extraordinary crisis: climate catastrophe, biodiversity collapse, and rapid population growth. The coming decades represent a critical period for facilitating our great upheaval while restoring the world to ecological and climatic health. The more effective our restoration efforts, the fewer people will need to migrate.
Human survival depends entirely on the world's living systems, yet one-fifth of countries now risk ecosystem collapse. By degrading soils, diminishing forests, losing coral reefs and poisoning rivers, we threaten our own existence.
One positive effect of human migration to urban centers is the potential for natural restoration in abandoned areas. Places left alone by people return to wild fecundity surprisingly quickly. Higher carbon dioxide levels and increased rainfall projected for the tropics, while problematic for humans, may benefit plant life.
Just as migration saves humans, it can save animals too. Many species face extinction not from climate change itself but from inability to migrate due to habitat destruction or human infrastructure. We must provide protected wildlife corridors and ensure healthy breeding populations.
By 2050, about half the world's population will live in vulnerable tropical regions that are becoming uninhabitable. Geoengineering methods to cool the planet are controversial but increasingly necessary. We have two main options: reducing atmospheric carbon dioxide (slow but restorative) or physically cooling the planet by reducing solar radiation (faster but riskier).
Ocean fertilization offers tremendous potential without consuming land. Oceans naturally absorb 40% of carbon dioxide through phytoplankton photosynthesis. Adding powdered iron to nutrient-poor ocean regions would dramatically increase phytoplankton production, reducing carbon dioxide and ocean acidification.
Given the stakes, we will inevitably deploy tools to reflect the sun's heat away from Earth. While this form of geoengineering remains taboo, we should recognize that our existing massive atmospheric pollution and fossil carbon release already constitutes planetary engineering-just destructive rather than restorative.
第 10 章
The Path Forward: Embracing Our Nomadic Future
The necessity for mass migration of billions is both absurd and increasingly inevitable. Despite possessing advanced climate science and technological capabilities, humanity remains constrained by outdated socio-political-economic structures of our own creation. Migration, far from being a crisis to prevent, represents a natural and necessary adaptation strategy. Even at today's relatively modest 1.2C warming, significant migration pressures are already manifesting in vulnerable regions. The challenge isn't the movement of people itself, but our collective failure to recognize migration as a solution rather than a problem.
Migration has historically served as a powerful engine of human progress and cultural evolution. Throughout history, the cross-pollination of ideas, technologies, and customs through human movement has catalyzed innovations and societal advances. Modern examples abound - from Silicon Valley's immigrant entrepreneurs to the cultural renaissance in cities like London and Toronto. Migrants consistently demonstrate remarkable resilience, entrepreneurial spirit, and adaptability. They often outperform in education, business creation, and innovation, while maintaining valuable connections between their origin and destination communities.
The coming climate-driven migrations will follow predictable patterns, flowing primarily from equatorial and low-lying regions toward more temperate zones and higher ground. This represents an unprecedented opportunity for historical justice, as nations that benefited most from fossil fuel-driven development can now offer sanctuary to those most impacted by climate change. Cities particularly stand to gain - from Tokyo to Munich, urban centers facing demographic decline need migrants to maintain economic dynamism and support aging populations. However, successful integration requires comprehensive policy frameworks, including streamlined visa systems, language training, skills recognition, and community support programs.
Climate change fundamentally reshapes human geography - altering agricultural zones, rendering some regions uninhabitable through heat and flooding, while potentially opening new frontiers in previously inhospitable areas. These shifts will trigger cascading effects across food systems, water resources, and critical infrastructure. Extreme weather events will increasingly force sudden mass movements, as witnessed during Hurricane Katrina or the California wildfires.
Yet amidst these daunting challenges, practical solutions exist. The COVID-19 pandemic demonstrated humanity's capacity for rapid adaptation and international cooperation when faced with existential threats. We can build climate-resilient communities through strategic urban planning, sustainable architecture, and robust social support systems. International frameworks like the Global Compact for Migration provide templates for coordinated responses. Success stories from countries like Uganda, which has successfully integrated millions of refugees while benefiting its economy, offer valuable lessons.
The path forward requires reimagining borders not as barriers but as bridges, developing anticipatory rather than reactive migration policies, and fostering inclusive societies that recognize diversity as a strength. Through careful planning, international cooperation, and commitment to human dignity, we can transform the challenge of climate migration into an opportunity for global renewal and sustainable development.
