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“Things like climate change, earthquakes, drought — they are of course realities of our lives,” Durusu-Tanrıöver said. “But there are human actions that can be taken to foresee what will happen and behave accordingly.

In the half-century leading up to empire’s collapse, the scientists found, the rings inside the tree trunks gradually start to get narrower — suggesting that water shortages were limiting the junipers’ growth. Chemical analyses of the kind of carbon captured in the wood also showed how drought altered the trees at the cellular level.

cuneiform tablets from that time in which Hittite officials fretted over rising food prices and asked for grain to be sent to their cities. But Manning said the empire — which was known for its elaborate water infrastructure projects and massive grain silos in major cities — should have been able to survive this “low frequency” drought.

between 1198 and 1196 B.C., the region was struck by three of the driest years in the entire 1,000-year-long tree ring record. The abrupt spurt of intensely dry weather may have been more than the Hittites could bear. Within a generation, the empire had dissolved.

“Very few societies ever plan for more than one or two disasters happening consecutively.”

“But I think it’s naive to believe that three years of drought would bring down the storerooms of the Hittite empire,” Weiss said. He argues that the longer-term drying trend, which has been documented in other studies, was probably more significant.

“What’s a crisis for some becomes almost an opportunity for others,” Manning said. “You have adaptation and resilience in the form of new states and new economies emerging.”

Durusu-Tanrıöver blames an unsustainable economy and centralized political system. The intensive agricultural practices required to support the capital city probably exhausted the region’s water resources and weakened surrounding ecosystems

parallels to modern urban areas, which are both major sources of planet-warming pollution and especially vulnerable to climate change impacts like extreme heat.

The Egyptian authorities’ efforts to screen out prominent organisations with a record of criticising their rule, particularly on the issue of human rights, comes amid growing concern over their treatment of protests and civil society at the Cop in Sharm el-Sheikh in November.

The UNFCCC told the Guardian host nations were permitted to invite organisations at their discretion for one-time access, but that “there is no fixed written policy” on one-time registration. The UK did not recommend any NGOs for one-time admission to attend Cop26.

The secretariat does not consider itself to be competent to unilaterally identify additional organisations from the host country

Abdallah said the Egyptian government wished to use Cop27 “to portray a different image of Egypt, one where people are kept away from cities suffering from pollution, poverty or repression. Part of this image is keeping critical voices out so that the only ones heard in Sharm el-Sheikh are those praising the government.”

Since coming to power in a military coup in 2013, Sisi has moved to strangle civil society activity. The state has demanded that NGOs receive government approval to continue operating and has outlawed funding received from abroad as a way to curtail their operations.

Organisations tracking detentions by security services, use of torture by state bodies or the state’s crackdown on civil rights have found their offices raided, their founders targeted with asset freezes and travel bans or their premises forcibly closed by the authorities.

Abdallah told the Guardian the ECRF had applied to attend Cop27 not just to represent Egyptian citizens but also to provide legal assistance in Sharm el-Sheikh to anyone detained for protesting.“Not allowing ECRF to attend strips participants from our protection, meaning protection from a watchdog organisation that can actually support them,” he said. “No one else is doing this.”

Climate justice activists have said Egypt should not be allowed to host Cop27 while thousands of prisoners of conscience remain behind bars, particularly the British-Egyptian activist and blogger Alaa Abd El-Fattah, now more than four months into a hunger strike. Abd El-Fattah, imprisoned on terrorism charges for a social media post, told his family during a recent visit that he believed he would die in prison.

Kinshasa, Congo: In a city whose geography still reflects segregationist colonial-era planning, where a handful of oligarchs lead gilded lives while the poor navigate systems broken by corruption and neglect, we get a glimpse of what it takes to break inequality’s shackles.

Mombasa, Kenya: The designs of foreign powers have molded African cities for centuries, especially along the continent’s coasts. From narrow-alleyed old towns to gleaming new container-shipping terminals, port cities like this one are layered with evidence of how budding empires, in the Arab world, Europe and now China, sought to remake them.

Abidjan, Ivory Coast: Despite fearmongering that Africa’s growing population will flood into wealthier parts of the world, cosmopolitan cities like this one draw most of Africa’s migrants and serve as models of tolerance, welcoming immigration policies and a reinvigorated Pan-African identity.

The traffic is a manifestation of what Lagosians fear most for their city: There is no plan. Lagos will balloon to 30 million, then 50 million, maybe even 100 million people, and meanwhile the government will keep unveiling new visions for the city that never come to fruition. Many doubt even its simplest promises, such as the impending inauguration of a single subway line that was supposed to open a decade ago.

Lagos emerges as the world’s most populous city at some point between now and 2100, in study after study. Changing the inputs affects only how soon and by how much.

A study published last year in the Lancet forecasts that Nigeria will become more populous than China by the end of the century, as birthrates rapidly shrink in some parts of the world — East Asia, eastern and southern Europe, the Caribbean — and level off in others, such as the United States, which is projected to have a similar population in 2100 as now.

Ethiopia, the Democratic Republic of Congo and Tanzania are all forecast to join Nigeria among the 10 most populous countries by 2100. North Africa and southern Africa, while continuing to grow, will do so at much lower rates than the rest of the continent.

“The people who govern this city are brutes, banning this and that left and right,” said Olushola, who, like countless others, pays off police officers to continue working. “We are providing a service that millions of people need 24/7. There is no alternative except to walk, and they ban us.”

Lawanson and other researchers cautioned against believing wholesale in projections of 80 million or even 100 million people in greater Lagos. Not because that’s infeasible, but because the city is already so strained, there’s no guarantee that people will continue to find the kind of economic opportunity that draws them here now.

in a city where the first and only major bridge over the lagoon was built decades ago, his assurance that not one but five more are being planned is scoffed at by many Lagosians — as are the four metro lines he says are “in the pipeline.”

“All the energy in the humanitarian world gets channeled toward emergencies, and so we don’t end up talking about what happens as a result — the big current underneath our work, which is massive urban influx,” said Bernard Lami, the IOM’s deputy head in Sudan.

“We cannot be like Dubai, which is a utopian aspiration some of our leaders have. We have to be the best Lagos we can be.”

For half a century now, displacement by catastrophe has been the main driver of growth in Khartoum. This is the biggest of a downtrodden club of African cities where people have brought their lives on donkey carts or in rickety trucks, far from hometowns abandoned because of conflict or climate change — or both.

Ivory Coast, where foreigners now account for nearly 20 percent of the country’s economy, more than anywhere else in Africa.

Around 40 percent of the world’s internally displaced people are in Africa

“There are millions of us living in these places that politicians never set foot in except to tear them down so they can make an industrial zone or new, big houses,”

In camps-turned-neighborhoods like Haj Yousif, long-oppressed groups from Sudan’s hinterlands discovered common histories and common cause. The city, after providing safety, became an organizing ground for groups that wanted to ensure that the safety was lasting. In Sudan, that meant first getting rid of Bashir.

“In the revolution, that’s partly what we were fighting against. There were big political issues, but it was also about mismanagement,” he added. “How long will it take for the needs of the people to become part of our governance? Ten, 20 years — or after we’re long gone? I guess it will always depend on us, the people, ourselves.”

Without new infrastructure to keep up with the growth, it now takes longer to cross Lagos from one edge to the other in a danfo than it does to fly to Lagos from Europe.

The shifting dynamics have been a source of concern in Western capitals, which have seen their cachet on the continent decline. And the changes have spawned warnings from those same capitals to African governments that they are being tricked into debt traps that leave strategic resources and infrastructure vulnerable to Chinese takeover.That view has been increasingly discounted by scholars, in part because Chinese lenders have not requisitioned any major infrastructure projects even as debts continue to mount. Chinese loans to Africa also have declined after a high in 2013, the year China launched its ambitious Belt and Road Initiative to link its markets with the rest of the world.

loans laden with confidentiality clauses

Opaque loans and closer ties with Beijing have strengthened African governments that have little regard for democracy, human rights or economic equality

“We have deep water, we’re on the equator, we’re on the way from everywhere to everywhere else,” said Kalandar Khan, a historian of Kenya’s coast whose ancestors were brought from Baluchistan, in what is now Pakistan, to Mombasa four centuries ago by Omani sultans who employed them as mercenaries.

Mombasa, Kenya’s second-biggest city, is expected to grow rapidly as it accelerates its shift from being an outdated spice-route waypoint to a major global city that funnels goods to all of East Africa, a region with one of the world’s fastest-growing populations.

The United States in particular has sought to counter China’s ascent in Africa with questions about respect for human rights and the environment in Chinese-linked projects. The approach has not prevented any of those projects from pushing forward.

Responding to skepticism about Chinese intentions, many Africans simply ask: What is the problem with getting help to attain the same level of development others have? And who are Western governments to raise questions about human rights and accountability in Africa when their own record is atrocious?

she, like the majority of African migrants, did something many in the West might not expect, especially after a decade of fearmongering by populist politicians and a relentless focus in the media on the most desperate, perilous voyages in search of asylum.Gadji immigrated, legally, to another African country.

The majority of African migrants, both rich and poor, do not cross oceans, but rather land borders within Africa.Ninety-four percent of African migration across oceans takes a regular, legal form.At least 80 percent of Africans contemplating migration say they have no interest in leaving the continent.

Like many port cities, Mombasa is infused with distant cultures. From its centuries-old core, its expansion has been spurred by sultanates, seafaring mercantilists and great world powers, which all saw economic opportunity in its protected inlets.

Like New York or Paris, Ivory Coast’s biggest city, Abidjan, is a cosmopolitan patchwork of neighborhoods where flavors, languages and histories overlap. As Africa’s population grows, Abidjan, Nairobi, Johannesburg and other cities across the continent that brim with opportunity will reap the dividends of that growth, especially if Western countries continue to suppress African migration flows off the continent.

In modern West Africa, home to 17 countries, locals often see borders as a hindrance — or even a fallacy — more useful to the Europeans who created them than the Africans who have to navigate them.

Despite relatively low historical levels of African migration to Europe, European Union member states have paid billions of dollars to West African governments over the past decade in return for strict enforcement of border controls aimed at preventing African migrants from reaching European shores.

“There are levels of irony here. Europe has integrated into a union, and yet they pay us to isolate ourselves,” said Issiaka Konate, a senior official in Ivory Coast’s ministry that promotes regional integration. “By doing so, they create an opportunity for criminal networks to operate in human trafficking, which has led to a profusion of armed groups and instability. Migration is not the political lightning rod in West Africa that it is in Europe. We welcome it.”

For most of its post-independence period, Ivory Coast has sought to lure migrants with relatively high wages, especially in its cocoa industry, the world’s largest. That alone has drawn millions from Guinea, Mali, Burkina Faso, Niger and others, and propelled Ivory Coast forward as the region’s best-performing economy.

Nearby countries such as Niger, which has the world’s highest birthrate and lowest standard of living, are replete with reasons to leave

The food stall’s owner said that in just five years, 15 young men like Amadou had come and gone, earning enough to go back home comfortably.“Garba makes us popular here. It is cheap, it is fast, it is tasty. People appreciate us,” Amadou said, explaining why he’d chosen Abidjan over Europe.“Europe is unimaginable to me. Very few people dream of Europe, frankly — and they are people you could say who dream too much.”

Europe has restricted the flow to exceptionally strong-willed migrants for whom the lure of Europe is hard to shake.

To an older generation of migrants, the fixation on Europe and the insistence that it’s the only place to make enough money to live the good life is a sinister myth driven by a few success stories.

“In my youth, there was no word ‘immigration’ — saying a fellow African is a foreigner is itself a foreign concept,” he said. “Well, it is an infectious concept and a political tool — the blame game, the creation of difference, those classic divide-and-rule mentalities of the West, are they not? It is a miseducation foisted upon us.”