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the planet could see a greater temperature increase in the next 50 years than it did in the last 6,000 years combined. By 2070, the kind of extremely hot zones, like in the Sahara, that now cover less than 1% of the earth’s land surface could cover nearly a fifth of the land, potentially placing 1 of every 3 people alive outside the climate niche where humans have thrived for thousands of years. Many will dig in, suffering through heat, hunger and political chaos, but others will be forced to move on

In Southeast Asia, where increasingly unpredictable monsoon rainfall and drought have made farming more difficult, the World Bank points to more than 8 million people who have moved toward the Middle East, Europe and North America. In the African Sahel, millions of rural people have been streaming toward the coasts and the cities amid drought and widespread crop failures. Should the flight away from hot climates reach the scale that current research suggests is likely, it will amount to a vast remapping of the world’s populations.

Migration can bring great opportunity not just to migrants but also to the places they go

Northern nations can relieve pressures on the fastest-warming countries by allowing more migrants to move north across their borders, or they can seal themselves off, trapping hundreds of millions of people in places that are increasingly unlivable. The best outcome requires not only goodwill and the careful management of turbulent political forces; without preparation and planning, the sweeping scale of change could prove wildly destabilizing. The United Nations and others warn that in the worst case, the governments of the nations most affected by climate change could topple as whole regions devolve into war

Drought helped push many Syrians into cities before the war, worsening tensions and leading to rising discontent; crop losses led to unemployment that stoked Arab Spring uprisings in Egypt and Libya; Brexit, even, was arguably a ripple effect of the influx of migrants brought to Europe by the wars that followed. And all those effects were bound up with the movement of just 2 million people. As the mechanisms of climate migration have come into sharper focus — food scarcity, water scarcity and heat — the latent potential for large-scale movement comes to seem astronomically larger.

Our model projects that migration will rise every year regardless of climate, but that the amount of migration increases substantially as the climate changes. In the most extreme climate scenarios, more than 30 million migrants would head toward the U.S. border over the course of the next 30 years

If governments take modest action to reduce climate emissions, about 680,000 climate migrants might move from Central America and Mexico to the United States between now and 2050. If emissions continue unabated, leading to more extreme warming, that number jumps to more than a million people. (None of these figures include undocumented immigrants, whose numbers could be twice as high.)

As with much modeling work, the point here is not to provide concrete numerical predictions so much as it is to provide glimpses into possible futures. Human movement is notoriously hard to model, and as many climate researchers have noted, it is important not to add a false precision to the political battles that inevitably surround any discussion of migration. But our model offers something far more potentially valuable to policymakers: a detailed look at the staggering human suffering that will be inflicted if countries shut their doors.

the coronavirus pandemic has offered a test run on whether humanity has the capacity to avert a predictable — and predicted — catastrophe. Some countries have fared better. But the United States has failed. The climate crisis will test the developed world again, on a larger scale, with higher stakes

Climate is rarely the main cause of migration, the studies have generally found, but it is almost always an exacerbating one.

To better understand the forces and scale of climate migration over a broader area, The New York Times Magazine and ProPublica joined with the Pulitzer Center in an effort to model, for the first time, how people will move across borders

North Africa’s Sahel provides an example. In the nine countries stretching across the continent from Mauritania to Sudan, extraordinary population growth and steep environmental decline are on a collision course. Past droughts, most likely caused by climate change, have already killed more than 100,000 people there. And the region — with more than 150 million people and growing — is threatened by rapid desertification, even more severe water shortages and deforestation. Today researchers at the United Nations estimate that some 65% of farmable lands have already been degraded. “My deep fear,” said Solomon Hsiang, a climate researcher and economist at the University of California, Berkeley, is that Africa’s transition into a post-climate-change civilization “leads to a constant outpouring of people.”

The story is similar in South Asia, where nearly one-fourth of the global population lives. The World Bank projects that the region will soon have the highest prevalence of food insecurity in the world. While some 8.5 million people have fled already — resettling mostly in the Persian Gulf — 17 million to 36 million more people may soon be uprooted, the World Bank found. If past patterns are a measure, many will settle in India’s Ganges Valley; by the end of the century, heat waves and humidity will become so extreme there that people without air conditioning will simply die.

We are now learning that climate scientists have been underestimating the future displacement from rising tides by a factor of three, with the likely toll being some 150 million globally. New projections show high tides subsuming much of Vietnam by 2050 — including most of the Mekong Delta, now home to 18 million people — as well as parts of China and Thailand, most of southern Iraq and nearly all of the Nile Delta, Egypt’s breadbasket. Many coastal regions of the United States are also at risk.

rough predictions have emerged about the scale of total global climate migration — they range from 50 million to 300 million people displaced — but the global data is limited, and uncertainty remained about how to apply patterns of behavior to specific people in specific places.

Once the model was built and layered with both approaches — econometric and gravity — we looked at how people moved as global carbon concentrations increased in five different scenarios, which imagine various combinations of growth, trade and border control, among other factors. (These scenarios have become standard among climate scientists and economists in modeling different pathways of global socioeconomic development.)

every one of the scenarios it produces points to a future in which climate change, currently a subtle disrupting influence, becomes a source of major disruption, increasingly driving the displacement of vast populations.

Around 2012, a coffee blight worsened by climate change virtually wiped out El Salvador’s crop, slashing harvests by 70%. Then drought and unpredictable storms led to what a U.N.-affiliated food-security organization describes as “a progressive deterioration” of Salvadorans’ livelihoods.

climate change can act as what Defense Department officials sometimes refer to as a “threat multiplier.”

For all the ways in which human migration is hard to predict, one trend is clear: Around the world, as people run short of food and abandon farms, they gravitate toward cities, which quickly grow overcrowded. It’s in these cities, where waves of new people stretch infrastructure, resources and services to their limits, that migration researchers warn that the most severe strains on society will unfold

the World Bank has raised concerns about the mind-boggling influx of people into East African cities like Addis Ababa, in Ethiopia, where the population has doubled since 2000 and is expected to nearly double again by 2035

now a little more than half of the planet’s population lives in urban areas, but by the middle of the century, the World Bank estimates, 67% will. In just a decade, 4 out of every 10 urban residents — 2 billion people around the world — will live in slums

In the case of Addis Ababa, the World Bank suggests that in the second half of the century, many of the people who fled there will be forced to move again, leaving that city as local agriculture around it dries up.

High emissions, with few global policy changes and relatively open borders, will drive rural El Salvador — just like rural Guatemala — to empty out, even as its cities grow. Should the United States and other wealthy countries change the trajectory of global policy, though — by, say, investing in climate mitigation efforts at home but also hardening their borders — they would trigger a complex cascade of repercussions farther south, according to the model. Central American and Mexican cities continue to grow, albeit less quickly, but their overall wealth and development slows drastically, most likely concentrating poverty further. Far more people also remain in the countryside for lack of opportunity, becoming trapped and more desperate than ever.

By midcentury, the U.N. estimates that El Salvador — which has 6.4 million people and is the most densely populated country in Central America — will be 86% urban

Most would-be migrants don’t want to move away from home. Instead, they’ll make incremental adjustments to minimize change, first moving to a larger town or a city. It’s only when those places fail them that they tend to cross borders, taking on ever riskier journeys, in what researchers call “stepwise migration.” Leaving a village for the city is hard enough, but crossing into a foreign land — vulnerable to both its politics and its own social turmoil — is an entirely different trial.

I arrived in Tapachula five weeks after the breakout to find a city cracking in the crucible of migration. Just months earlier, passing migrants on Mexico’s southern border were offered rides and tortas and medicine from a sympathetic Mexican public. Now migrant families were being hunted down in the countryside by armed national-guard units, as if they were enemy soldiers.

Models can’t say much about the cultural strain that might result from a climate influx; there is no data on anger or prejudice. What they do say is that over the next two decades, if climate emissions continue as they are, the population in southern Mexico will grow sharply. At the same time, Mexico has its own serious climate concerns and will most likely see its own climate exodus. One in 6 Mexicans now rely on farming for their livelihood, and close to half the population lives in poverty. Studies estimate that with climate change, water availability per capita could decrease by as much as 88% in places, and crop yields in coastal regions may drop by a third. If that change does indeed push out a wave of Mexican migrants, many of them will most likely come from Chiapas.

even as 1 million or so climate migrants make it to the U.S. border, many more Central Americans will become trapped in protracted transit, unable to move forward or backward in their journey, remaining in southern Mexico and making its current stresses far worse.

Already, by late last year, the Mexican government’s ill-planned policies had begun to unravel into something more insidious: rising resentment and hate. Now that the coronavirus pandemic has effectively sealed borders, those sentiments risk bubbling over. Migrants, with nowhere to go and no shelters able to take them in, roam the streets, unable to socially distance and lacking even basic sanitation. It has angered many Mexican citizens, who have begun to describe the migrants as economic parasites and question foreign aid aimed at helping people cope with the drought in places where Jorge A. and Cortez come from.

a new Mexico-first movement, organizing thousands to march against immigrants

Trump had, as another senior government official told me, “held a gun to Mexico’s head,” demanding a crackdown at the Guatemalan border under threat of a 25% tariff on trade. Such a tax could break the back of Mexico’s economy overnight, and so López Obrador’s government immediately agreed to dispatch a new militarized force to the border.

laying blame at the feet of neoliberal economics, which he said had produced a “poverty factory” with no regional development policies to address it. It was the system — capitalism itself — that had abandoned human beings, not Mexico’s leaders. “We didn’t anticipate that the globalization of the economy, the globalization of the law … would have such a devastating effect,”

No policy, though, would be able to stop the forces — climate, increasingly, among them — that are pushing migrants from the south to breach Mexico’s borders, legally or illegally. So what happens when still more people — many millions more — float across the Suchiate River and land in Chiapas? Our model suggests that this is what is coming — that between now and 2050, nearly 9 million migrants will head for Mexico’s southern border, more than 300,000 of them because of climate change alone.

“If we are going to die anyway,” he said, “we might as well die trying to get to the United States.”

El Paso is also a place with oppressive heat and very little water, another front line in the climate crisis. Temperatures already top 90 degrees here for three months of the year, and by the end of the century it will be that hot one of every two days. The heat, according to researchers at the University of California, Berkeley, will drive deaths that soon outpace those from car crashes or opioid overdoses. Cooling costs — already a third of some residents’ budgets — will get pricier, and warming will drive down economic output by 8%, perhaps making El Paso just as unlivable as the places farther south.

Without a decent plan for housing, feeding and employing a growing number of climate refugees, cities on the receiving end of migration can never confidently pilot their own economic future.

The United States refused to join 164 other countries in signing a global migration treaty in 2018, the first such agreement to recognize climate as a cause of future displacement. At the same time, the U.S. is cutting off foreign aid — money for everything from water infrastructure to greenhouse agriculture — that has been proved to help starving families like Jorge A.’s in Guatemala produce food, and ultimately stay in their homes. Even those migrants who legally make their way into El Paso have been turned back, relegated to cramped and dangerous shelters in Juárez to wait for the hearings they are owed under law.

There is no more natural and fundamental adaptation to a changing climate than to migrate. It is the obvious progression the earliest Homo sapiens pursued out of Africa, and the same one the Mayans tried 1,200 years ago. As Lorenzo Guadagno at the U.N.’s International Organization for Migration told me recently, “Mobility is resilience.” Every policy choice that allows people the flexibility to decide for themselves where they live helps make them safer.

what may be the worst-case scenario: one in which America and the rest of the developed world refuse to welcome migrants but also fail to help them at home. As our model demonstrated, closing borders while stinting on development creates a somewhat counterintuitive population surge even as temperatures rise, trapping more and more people in places that are increasingly unsuited to human life

the global trend toward building walls could have a profound and lethal effect. Researchers suggest that the annual death toll, globally, from heat alone will eventually rise by 1.5 million. But in this scenario, untold more will also die from starvation, or in the conflicts that arise over tensions that food and water insecurity will bring

America’s demographic decline suggests that more immigrants would play a productive role here, but the nation would have to be willing to invest in preparing for that influx of people so that the population growth alone doesn’t overwhelm the places they move to, deepening divisions and exacerbating inequalities.

At the same time, the United States and other wealthy countries can help vulnerable people where they live, by funding development that modernizes agriculture and water infrastructure. A U.N. World Food Program effort to help farmers build irrigated greenhouses in El Salvador, for instance, has drastically reduced crop losses and improved farmers’ incomes. It can’t reverse climate change, but it can buy time.

Thus far, the United States has done very little at all. Even as the scientific consensus around climate change and climate migration builds, in some circles the topic has become taboo. This spring, after Proceedings of the National Academy of Sciences published the explosive study estimating that, barring migration, one-third of the planet’s population may eventually live outside the traditional ecological niche for civilization, Marten Scheffer, one of the study’s authors, told me that he was asked to tone down some of his conclusions through the peer-review process and that he felt pushed to “understate” the implications in order to get the research published. The result: Migration is only superficially explored in the paper.

Our modeling and the consensus of academics point to the same bottom line: If societies respond aggressively to climate change and migration and increase their resilience to it, food production will be shored up, poverty reduced and international migration slowed — factors that could help the world remain more stable and more peaceful. If leaders take fewer actions against climate change, or more punitive ones against migrants, food insecurity will deepen, as will poverty. Populations will surge, and cross-border movement will be restricted, leading to greater suffering. Whatever actions governments take next — and when they do it — makes a difference.

The world can now expect that with every degree of temperature increase, roughly a billion people will be pushed outside the zone in which humans have lived for thousands of years

“If we don’t develop a different attitude,” he said, “we’re going to be like people in the lifeboat, beating on those that are trying to climb in.”

companies make huge profits from the growing border security market. At the same time, they exert “significant influence in the development of European migration policies, by successfully pushing the underlying narrative of framing migration as a threat, a security problem. Challenging this narrative would be an important step [to] changing EU policies.”

most migrants come from the richest countries, not from the poorest (9% of Europeans emigrate while 2.6% of Africans do)

Over the past few years, the European political left has reacted to the rise of the extreme right by following in its footsteps in problematising and securitising migration. This is “a huge mistake,”

there is currently no migration crisis in Europe, even though politicians and much of the mainstream media will often have us think so. 

In order to match European labour demand and foreign labour supply, however, "we would need to ‘Europeanise’ the labour market," said Tineke Strik,

if the main issue is a lack of political will for a more humane and fair migration policy, how could that be changed?

the main driver of migration is labour demand: most migrants come to do jobs that are in short supply. This demand is in part shaped by the state. For example, he explains, many people travel to France, but not to The Netherlands to take up work as au pairs because of the highly subsidised child-care system in the latter. 

one question to ask policymakers and the public is: why do we need immigrants? What are the benefits? “This has paid off in terms of Canadians generally supporting our immigration policy,"

the “inconceivable political advantage” to the Canadian system is that immigration appears predictable for the broader public. It "calms" the debate, he said, “and increases the policy space for and trust in governments to implement more balanced migration policies.”

“The main driver of the heated debate about migration is the feeling of "loss of control" [...] Yet, the only political response to this feeling of loss of control so far seems to be increased restriction. This will likely lead to more irregular movements and hereby increase the feeling of control loss. A vicious cycle.”

move away from equating control and restriction, and towards a situation where control simply means that most people migrate within legal frameworks

At national or European level the migration debate is often heated and deadlocked, yet if we look at the city or town level, we see something completely different.It’s a more pragmatic level

What if instead, we talked about “health care, labour markets, education etc, and look at migration through the lens of these topics - not the other way round.”

The widely reproduced claim that 2 to 3 million people were driven into extreme poverty by the 2006–2009 drought was drawn, extraordinarily, from analyses by the United Nations Development Programme (UNDP) of pre-drought poverty levels.[4] The claim that around 1.5 million people were displaced was derived from a single humanitarian news bulletin, seemingly on the basis of a misreading of the UN’s estimate of those affected—not displaced—by the drought. Using Syrian government numbers, the UN actually reported drought-period displacement to be around 40,000–60,000 families.

A presidential decree in 2008, which tightened restrictions on land sales across the northeastern-most province of Hasakah, led to the extensive loss of land rights and was credited by some organizations as a key factor in the increased migration from northeast Syria prior to the war

during 2008–2009 rural Syria was hit by triple-digit increases in the prices of key agricultural inputs. In May 2008 fuel subsidies were halved, leading to an overnight 342 percent spike in the price of diesel. And then in May 2009 fertilizer subsidies were removed, causing prices to rise anywhere from 200 to 450 percent. The fuel subsidy cuts had particularly devastating economic consequences, especially for farmers reliant on cheap fuel for groundwater irrigation.

The fact that a number of neighboring countries experienced equivalent precipitation declines during 2006–2009—or in Iraq’s case an even larger decline—but no comparable migration crises, suggests at the very least that the migration from Syria’s northeast must have been caused more by these Syria-specific factors than by the drought.

Within just a few short years, Syria embraced principles of economic liberalization, privatized state farms, liberalized trade and reduced price control levels. At the same time domestic oil production and exports fell rapidly, thus undermining the regime’s rentier foundations and its capacity to subsidize agriculture

as Marwa Daoudy concludes in her new book on the subject, there is “little evidence” that “climate change in Syria sparked popular revolt in 2011”—but “a lot of evidence” that “suggests it did not.”

a deep and long-term structural agrarian crisis

it is evident that northeastern Syria’s agrarian troubles—and especially those in the province of Hasakah—went all the way back to 2000, and indeed earlier. Production of the two main government-designated strategic crops, wheat and cotton, was in decline in Hasakah from the early 2000s onward. Land and settlements were being abandoned there well before the drought. Net out-migration from Hasakah during this period was higher than from any other province. And the reasons for this lay not in the drought but in the contradictions of Syrian development.

an agrarian socialist development program, promoting rapid expansion of the country’s agricultural sector and deploying Soviet aid and oil income to this end. Among other elements, this program involved heavy investment in agricultural and especially water supply infrastructure, low interest loans for private well drilling, price controls on strategic crops at well above international market value, the annual wiping clean of state farm losses and, as already indicated, generous input subsidies

Environmentally, the model relied above all on the super-exploitation of water resources, especially groundwater—a problem which by the early 2000s had become critical. And economically, Syrian agriculture had become highly input dependent, reliant on continuing fuel subsidies in particular.

Proponents of the climate conflict thesis typically claim that drought-induced displacement caused a “population shock” within Syria’s urban peripheries, exacerbating pre-existing socio-economic pressures. Yet Syria’s cities grew rapidly throughout the decade before the civil war, not only during the drought years. By our calculations, excess migration from the northeast during 2008–2009 amounted to just 4–12 percent of Syria’s 2003–2010 urban growth (and this excess migration was not all triggered by drought)

Irrespective of any drought impacts, these developments essentially occurred when the props that had until then artificially maintained an over-extended agricultural production system—oil export rents, a pro-agrarian ideology and their associated price controls—were suddenly and decisively removed.

As Syria’s pre-eminent breadbasket region—the heartland of strategic crop production—Hasakah was particularly vulnerable to economic liberalization and the withdrawal of input supports. No other region of the country was so dependent on groundwater for irrigation, a factor that made it particularly vulnerable to fuel price increases. Hasakah’s groundwater resources were also exceptionally degraded, even by Syrian standards

The region was also deeply affected by intense irrigation development and over-abstraction of groundwater resources within Turkey

It was Ba’athist state policies which had turned Hasakah into a region of wheat monoculture, failed to promote economic diversification and facilitated cultivation ever deeper into the badiya (the desert) while over-exploiting surface and groundwater resources. Moreover, these measures were taken partly for strategic and geostrategic reasons, bound up with regime interests in expanding and consolidating Hasakah’s Arab population (its project of Arabization), in controlling and excluding the province’s Kurdish population and in extending its control and presence within a strategically sensitive borderland and frontier region. During the heyday of Ba’athist agrarian development, Hasakah’s population and agricultural sector expanded like in no other area. With the collapse of this development model, rural crisis and out-migration were the inevitable result.

After an initial reluctance to acknowledge the depth of the crisis in the northeast, the government eventually embraced the climate crisis narrative with gusto. The drought was “beyond our powers,” claimed Asad. The drought was “beyond our capacity as a country to deal with,” claimed the Minister of Agriculture. “Syria could have achieved [its] goals pertaining to unemployment, poverty and growth if it was not for the drought,” proclaimed Deputy Prime Minister Abdullah al-Dardari.[12] Indeed, as the International Crisis Group reported, the Asad regime would regularly take diplomats to the northeast and tell them, “it all has to do with global warming,” blaming what was in essence a state-induced socio-ecological crisis on climatic transformations beyond its control.[13] This shifting of blame is essentially how the Syria climate crisis narrative began.

Official UN reports on the crisis in the northeast, which were produced in collaboration with the Syrian regime, were predictably drought-centric, barely mentioning any factors other than drought, omitting any criticisms of government policy and ignoring the existence of a discriminated-against Kurdish minority

International media reports on the subject were similarly focused on  drought, no doubt partly because of media preferences for simplified and striking narratives, but also because they relied upon UN sources and took these at their word

The climate crisis narrative reached its apogee in 2015, in the run-up to the UN Paris conference on climate change, when countless politicians and commentators turned to the example of Syria to illustrate the urgency of international action to limit greenhouse gas emissions.

regurgitated as a statement of fact in the scientific journal Proceedings of the National Academy of Sciences and by Western liberal politicians and eco-socialist campaigners alike

climate change is also much more than a physical reality and looming environmental threat: It is simultaneously an object of discourse, debate and rhetoric, a potent meta-narrative that can be invoked for explanation, legitimation, blame avoidance and enrichment.

climate change is already regularly invoked to questionable ends across the Middle East and North Africa. It is used to explain away ecological catastrophes actually caused by unsustainable agricultural expansion, to make the case for investment in new and often unnecessary mega-projects, to obscure state mismanagement of local environmental resources and to argue against the redistribution of such resources to oppressed and minority groups

blaming climate change is often a distraction from the real causes of socio-ecological crisis

German MEP Özlem Demirel is campaigning against the EU’s use of drones and links to arms companies, which she says has turned migration into a security issue.“The arms industries are saying: ‘This is a security problem, so buy my weapons, buy my drones, buy my surveillance system,’” says Demirel.“The EU is always talking about values like human rights, [speaking out] against violations but … week-by-week we see more people dying and we have to question if the EU is breaking its values,” she says.

Poland is hoping to emulate Greece in response to the crisis on its border with Belarus. In October, its parliament approved a €350m wall that will stretch along half the border and reach up to 5.5 metres (18 feet), equipped with motion detectors and thermal cameras.

In September, Greece opened a refugee camp on the island of Samos that has been described as prison-like. The €38m (£32m) facility for 3,000 asylum seekers has military-grade fencing and CCTV to track people’s movements. Access is controlled by fingerprint, turnstiles and X-rays. A private security company and 50 uniformed officers monitor the camp. It is the first of five that Greece has planned; two more opened in November.

The EU spent €4.5m (£3.8m) on a three-year trial of artificial intelligence-powered lie detectors in Greece, Hungary and Latvia. A machine scans refugees and migrants’ facial expressions as they answer questions it poses, deciding whether they have lied and passing the information on to a border officer.The last trial finished in late 2019 and was hailed as a success by the EU but academics have called it pseudoscience, arguing that the “micro-expressions” the software analyses cannot be reliably used to judge whether someone is lying. The software is the subject of a court case taken by MEP Patrick Breyer to the European court of justice in Luxembourg, arguing that there should be more public scrutiny of such technology. A decision is expected on 15 December.