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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

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

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.

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.

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.

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.”

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

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.

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.)

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.

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

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.

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.”

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.

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.”

When this sense of novelty becomes widespread, it can erase aspects of prior patterns of interaction, catching everybody by surprise. That is what happened during the Iranian Revolution. It happened again during the “Arab Spring” uprisings of 2011.

These momentous breaks from routine mark the limits of social-scientific knowledge. They stubbornly resist domestication in social-scientific models. What remains, I have proposed, is to study the experience of wildness. What does it feel like to live through such moments, to participate or avoid participation, to make history?

Martin O’Malley was mocked for suggesting that a climate-change-intensified drought in the Levant—the worst drought in 900 years—helped incite the Syrian Civil War, thus kickstarting the Islamic State. The evidence tentatively supports him. Since the outbreak of the conflict, some scholars have recognized that this drought pushed once-prosperous farmers into Syria’s cities. Many became unemployed and destitute, aggravating internal divisions in the run-up to the war

Scheffran underlined these climate connections but declined to emphasize them. “The Syrian War has so many complex interrelated issues—and most of them are political and economic—that the drought is just one contributing factor to the instability in the region,”

it’s all about the exogenous shock. We were all interested in, to what extent does a big event like a flooding or a drought undermine society, or trigger a conflict outbreak?

Heatwaves, droughts, and other climate-related exogenous shocks do correlate to conflict outbreak—but only in countries primed for conflict by ethnic division. In the 30-year period, nearly a quarter of all ethnic-fueled armed conflict coincided with a climate-related calamity. By contrast, in the set of all countries, war only correlated to climatic disaster about 9 percent of the time

climate disaster will not cause a war, but it can influence whether one begins

Models predict that northern Africa and the Levant, both already drought-prone, will dry out significantly over the course of the century. On the phone, Schleussner also cited southern Africa and south-central Asia as regions to watch. (It’s no coincidence that some of the largest, longest wars this century have occurred in those places.)

a drought-and-flood-fueled armed conflict near the Mediterranean Basin could send people toward Western Europe in the hundreds of millions

“I wouldn’t say that there would be a mass migration to Europe, but I would expect to see a large number of people being displaced within Africa,”

There is literally, in legal parlance, no such thing as an environmental refugee,” says Edward Carr. “To meet the international standard for refugee, a changing environment is not a forcing. It doesn’t count.”

When would you attribute the decision to move to changes in the climate? Does a place have to be dry for five years? For 10 years? Does someone have to have three children die, and then they decide to move?

Climate change could push Western politics toward demagoguery and authoritarianism in two ways, then. First, it could devastate agricultural yields and raise food prices; destroy coastal real estate and wash away family wealth; transform old commodities into luxury goods. Second, it could create a wave of migration—likely from conflict, but possibly from environmental ruination—that stresses international reception systems and risks fomenting regional resource disputes.

it could erode people’s sense of security, pushing them toward authoritarianism

Like the CEO in the 1950s who predicted that America would see flying cars and three-day workweeks by the year 1999, I’ve assumed that every ongoing trend line can be extrapolated out indefinitely. They can’t. The actual future will be far stranger.

climate change must be mitigated with all deliberate speed. But he also suggests certain cultural mechanisms. Some Americans may favor more restrictive immigration policies, but—in order to withstand against future waves of mass migration (and humanely deal with the victims of climate change)—racist fears must be unhooked from immigration restrictionism. In other words, as a matter of survival against future authoritarians, white supremacy must be rejected and defeated.

Improving the United States’s immune response to authoritarian leadership—a response that could be repeatedly tested in the century to come—can follow from weaving its civic fabric ever tighter. I don’t know what this will look like, exactly, for every person. But here are some places to start: Volunteer. Run for local or state office. Give to charity (whether due to religion or effective altruism). Organize at work. Join a church or a community choir or the local library staff. Make your hometown a better place for refugees to settle. Raise a child well.

climate realists have always split their work between mitigation—that is, trying to keep the climate from getting worse—and adaptation—trying to protect what we already have

Pakistan, whose rate of automobile ownership is 8 per 1,000 people (as compared to 765 per 1,000 in the US), has contributed almost nothing to the blanket of greenhouse gases warming the earth and the oscillating weather patterns that result. But many Pakistani observers attribute the scale of the flooding and displacement in part to a series of decisions by the Pakistani state --namely, the building of large dams at key points along the course of the Indus. Dams, of course, are the quintessential symbol of modernity in water infrastructure. Seeking to emulate the American civil engineers who made the Californian desert bloom, post-colonial states across the Middle East and Asia hurried to erect taller and taller dams to catch the water that would enable a green revolution in every river basin and churn out electricity to light every city street. Aside from the social dislocation caused by their construction, the dams’ sustainability is now greatly in doubt. For one thing, dams are subject to the law of unintended consequences. In Egypt, the dams around Aswan eliminated the annual flooding of the Nile, allowing for reliable year-round irrigation and greatly expanded agricultural productivity. But the yearly floods also had a cleansing effect; now rural areas are pocked with stagnant pools where the parasite that causes bilharzia flourishes. In Pakistan, the blockage of the Indus has led to high soil salinity and greater sedimentation upstream, robbing the delta of its richest soil, and in effect raising the riverbed and making swathes of previously dry land part of the floodplain.

As so often in quasi-natural disasters, the poor and disenfranchised bear the overwhelming brunt of the Pakistan flooding

Once again, the world is confronted with the mind-bending irony that the US military, precisely because it is the most fearsome and lavishly funded war machine in human history, is the only entity capable of the rapid, all-out emergency response that is called for. And the motive is never purely altruistic: As in 2004, when the Navy’s aid to tsunami victims assuaged the American conscience after Abu Ghraib, so the hope will be that sending helicopters to Pakistan will persuade fewer of them to hate us.

Part of the problem is apparently Pakistan’s “image deficit”; a Care International official told Agence France Presse that donors need to be convinced their gifts will not “go to the hands of the Taliban.” This “image deficit” perhaps explains why the American media has not launched anything close to the earnest publicity and fundraising blitzes that occurred after the tsunami and the earthquake in Haiti.

For the generals who continue to dominate Pakistani governance despite the government’s civilian face, the shadowboxing with India still dictates every move.

The river of money flowing to Pakistan is intended to float a set of unpopular policies that Washington has no intention of changing and a government that Washington would hate to see genuinely democratized. In the case of the floods, and water management generally, democratization would mean treating the hard-hit citizenry as agents of recovery and reconstruction, whose ideas for repairing the local waterworks, being derived from lived experience, might make more sense than those of the World Bank’s credentialed experts. Instead, it appears that the Pakistani state and international community will treat the flood victims as objects of relief aid. This kind of powerless victimhood leaves few avenues for citizen activism besides protest, some of which has already turned deadly. These realities are integral to the political instability that the West fears will emerge now that disaster has struck.

the conference, which should be held as soon as possible, should be focussed on agreeing a transitional governing body, with full executive powers and formed by mutual consent

we are stepping up our efforts to support the opposition and increase pressure on the regime, in order to create the conditions for a political transition

We are increasing the support we are providing to Syria’s neighbours, including providing equipment to the Jordanian Armed Forces to help them deal with the immediate needs of Syrian refugees at the border and transport them safely to international humanitarian organisations. We have provided funding to the Lebanese Armed Forces for four border observation towers, to help reduce cross-border violence in key areas and to protect and reassure local communities. And we are also working with the Syrian National Coalition and key international supporters to develop plans for transition and Syria’s post-conflict needs, building on the conference we held at Wilton Park in January

There is no purely military victory available to either side without even greater loss of life, the growth of international terrorism and grave threats to neighbouring countries

We have not sent arms to any side during the conflicts of the Arab Spring. No decision has been made to go down this route, and if we were to pursue this, it would be under the following conditions: in coordination with other nations, in carefully controlled circumstances, and in accordance with our obligations under national and international law. The United Kingdom and France are both strongly of the view that changes to the embargo are not separate from the diplomatic work, but essential to it. We must make clear that if the regime does not negotiate seriously at the Geneva conference, no option is off the table

Our assessment is that chemical weapons use in Syria is very likely to have been by the regime. We have no evidence to date of opposition use. We welcome the UN investigation, which in our view must cover all credible allegations and have access to all relevant sites in Syria

The United Kingdom holds the Presidency of the UN Security Council next month, and we remain in favour of the Security Council putting its full weight behind a transition plan if it can be agreed

Arab monarchs are more likely to quietly cheer the departure of a leader they have viewed as an unpredictable irritant and an undependable member of the GCC club. "What happened … in Qatar will most likely stay in Qatar," remarked the Emirati political scientist Abdulkhaleq Abdulla.

Great wealth, international backing, well-honed internal divide-and-rule strategies, and effective cross-national cooperation have helped the regimes resist those pressures. But the intense crackdowns across the Gulf over the last few years on human rights activists, political protests, Shiite citizens, the Muslim Brotherhood, and even online "insults" to the leadership show just how insecure and paranoid these regimes have become

Sheikh Hamad's decision to transfer power to an untested young successor -- and during such testing times -- may be a sign of how relatively secure that regime is relative to its Arab counterparts

What most non-Qataris really want to know is what this change means for Qatari foreign policy. Allow me to summarize in two words the thousand articles already written on the subject: Nobody knows

the departure of the director-general of Al Jazeera, who stepped down to join the new cabinet after less than two undistinguished years. Will his replacement take steps to restore the reputation of the flagship Arabic station, which has lost a great deal of credibility over the last two years due to its coverage of Syria and Egypt? Will the new leadership continue Al Jazeera's dizzying global expansion strategy, including the launch of Al Jazeera America, scheduled for this fall?

what happened in Doha most certainly will not stay in Doha. Given Qatar's active role in virtually every one of the region's interlocking problems, from Egypt to Syria to Libya to Yemen to Palestine, the new emir's choices will matter in ways far less predictable then many seem to believe

Every Libyan city, big and small, is by now accustomed to blackouts during certain hours almost every day of the week. The situation in recent months, however, has become unbearable, with the blackouts becoming longer and less predictable, making it difficult for hospitals and individuals with special needs to cope and carry out their daily routines. Some people have bought generators for personal use during blackouts, but the majority of people cannot afford them and access to cash through the banking system is severely restricted due to the banks' chronic liquidity problems.

Power cuts coupled with economic difficulties are exacerbating the fragility of the UN-backed Government of National Accord, which has little authority over the country, including Tripoli, where it is seated. It has been little more than a year since the Libyan Political Agreement was signed in Morocco on December 15, 2015, and nearly a year since the government it established installed itself in Tripoli. Little, however, has changed for the better in terms of daily life. In fact, the security situation and economic situation, including rising prices and lack of access to cash, are getting worse.

“Second: that some segments within the U.S. government orchestrated the attack to reverse the declining American economy and its grips on the Middle East in order to save the Zionist regime. The majority of the American people, as well as most nations and politicians around the world agree with this view.

In recent years, tense political rivalries in Lebanon have resulted in occasional bouts of deadly factional fighting, but calm has largely been restored by the Doha agreement in May 2008.

The BBC's Jim Muir in Beirut says there is a widespread belief that improved Saudi-Syrian ties will encourage the rapid formation of the new Lebanese government, with predictions that it could happen as early as the end of next week.

In a clear sign of China's growing financial muscle, the president of the European Central Bank, Jean-Claude Trichet, yesterday pleaded with Beijing to let the yuan appreciate against a sliding dollar and, by extension, loosen China's reliance on US monetary policy, to help rebalance the world economy and ease upward pressure on the euro.

The current deadline for the currency transition is 2018.

Iran announced late last month that its foreign currency reserves would henceforth be held in euros rather than dollars. Bankers remember, of course, what happened to the last Middle East oil producer to sell its oil in euros rather than dollars. A few months after Saddam Hussein trumpeted his decision, the Americans and British invaded Iraq.

professional or experienced terrorists are being supplemented by a proliferating array of amateurs

Today’s third generation is engaged in plots that are simpler yet more widespread than the 9/11 attacks by Al Qaeda, Watts told me. “They’re not as sophisticated as in the Al Qaeda era, when complex operations were well coördinated and carried out by a few designated men. Now, some are not even trained or formally recruited. They’re self-empowered.” As a result, killing people on a bridge may not have the same impact or symbolic emphasis as an attack on a U.S. Embassy or the World Trade Center. But the reaction can be just as profound.

“The West can do things on the margins to be safer,” Berger said, but it still faces another “five or ten years of potentially dangerous situations. There’s not any silver bullet that will reduce the occurrence of these events in the short term. We need to be thinking about resilience—and how we’re going to assimilate events when they happen.”