Where this language family comes from

Celtic belongs to the Indo-European family, the group that also gave the world Latin, Greek, Sanskrit, Persian, Russian, and English. Proto-Celtic separated from Proto-Indo-European around 1300 BCE and left no written record. What linguists know about it was pieced together by comparing the surviving daughter languages and working backward toward whatever they must have shared.

Those daughter languages eventually divided in two. The ones that developed on the European mainland are collectively called Continental Celtic: Gaulish, Lepontic, Celtiberian, Gallaecian, Noric, and Galatian. All of them disappeared. The ones that developed in the British Isles and Ireland, called Insular Celtic, are where the six surviving languages came from: Irish, Scottish Gaelic, Manx, Welsh, Cornish, and Breton.

How Celtic reached so much of the continent

Celtic-speaking peoples spread through most of the European continent from around the 5th century BC, eventually reaching the Black Sea, the Anatolian Peninsula, Spain, Italy, and the British Isles. There was no Celtic empire behind any of this. The spread followed trade routes and migration, propelled by the cultural prestige of the La Tène metalworking tradition, which from roughly 450 BC became a status marker across much of Europe. Skilled ironwork, warrior aristocracy, and language traveled together as an interconnected package. By 300 BC that package had reached from the Atlantic coast of Iberia all the way to central Turkey.

Why the continental languages eventually disappeared

After Caesar conquered Gaul between 58 and 50 BC, Latin was adopted quickly by the Gaulish aristocracy, since speaking it meant access to Roman political networks and patronage, and trilingualism was already noted in southern Gaul by the 1st century BC. Farmers and rural communities took a very different path. A language woven into daily life and local custom can outlast political conquest by centuries. Gaulish is thought to have gone extinct around the late 6th century, some 600 years after Caesar’s campaigns.

Ireland, which Rome never reached, stayed monolingual Celtic until the Norman incursions of the 13th century. Irish settlers moving into Scotland in the 3rd and 4th centuries eventually extinguished Pictish, permanently replaced by Gaelic by the 12th century. Anglo-Saxon settlers pushing into Britain from the 5th century forced Brittonic steadily westward. Welsh survived in Wales. Cornish lasted in Cornwall right through to the 18th century. Breton survived in Brittany because people from southwestern Britain had carried it there in the 5th and 6th centuries.

Six survivors

Welsh, Irish, Scottish Gaelic, and Breton have been spoken without interruption. Cornish and Manx each broke that chain: Cornish in the late 18th century and Manx in 1974. Both were brought back through years of determined community work, and today, a new generation is growing up with them as first languages.

The six divide into two branches. Irish, Scottish Gaelic, and Manx share a common descent from Old Irish and form the Goidelic group. Welsh, Cornish, and Breton came from ancient Brittonic and form the Brittonic group. Some mutual intelligibility exists within the Goidelic group, particularly between the Scottish Gaelic of Islay and Argyll, Ulster Irish, and Manx. Welsh and Irish speakers find nothing mutually intelligible. The two branches have been developing independently for well over a thousand years.

Long before the Latin script arrived, Celtic languages were written using Ogham, a system of 25 characters cut as notches along a stem line. Around 500 of those inscriptions survive on stone, the oldest from the 4th century AD, found across Ireland, Scotland, Wales, and England.

How many speakers remain

In Ireland, Irish is compulsory in schools from early childhood right through to the final state exams, which means virtually every adult has spent years studying it. Using it daily is a different question. Most daily speakers live in rural Gaeltacht areas on the western coast, and only around 72,000 to 94,000 people actually use Irish on a daily basis, despite its status as a national language and an official EU language. Welsh occupies a noticeably different position. You hear Welsh on the streets of Cardiff and Swansea, not just in remote coastal villages. Welsh-medium school enrollment has grown steadily since the 1980s, and the total number of speakers has been rising rather than falling.

Before World War II, Breton was spoken by well over a million people across Brittany. Decades of active suppression in French schools brought that figure down to under a quarter of what it once was. Welsh is the only Celtic language UNESCO does not classify as endangered.

About 2 million people speak a Celtic language today, native and non-native speakers combined. Set against the 300 BC maps, that is a dramatic contraction of geographic ground. But Welsh gains speakers year on year. Cornish and Manx crossed from complete extinction to genuine first-language communities within a single human generation.

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In Bulgaria, 37% say earning money is the most important role of a man. In Poland, just 22% think it’s acceptable for men to cry. I mapped all of it from Special Eurobarometer 545.

Take that first question. Sweden: 95%. Poland: 22%. The EU average is 51%, meaning the continent is genuinely split on this. And nearly every other question in the survey produces the same geographic shape.

In the Netherlands, 3% see earning money as a man’s primary role and 2% see homemaking as a woman’s primary role. Bulgaria comes in at 37% and 35%. On whether men are naturally less competent at household tasks, Denmark records 3% and Bulgaria 28%.

On financial independence being equally important for both sexes, Poland lands at 40% and Sweden at 90%.

The communist period explains more of this than might initially seem obvious. Communist governments across Eastern Europe pushed women into the workforce at high rates. Female labor participation across much of the Eastern Bloc was genuinely substantial by the 1970s. But they left the household entirely alone. From the mid-1950s onward, state-ordained women’s organizations promoted a vision in which working women had to juggle their commitment to the workplace with their obligations toward the family, managing what became known as the “double burden.” The system encouraged women to hold full-time jobs while leaving domestic authority exactly where it had always been. The fall of those regimes and the economic difficulties of the 1990s did not lead to restructuring in most households.

Sweden and Denmark spent those same decades differently. Parental leave that fathers were expected to take, subsidized childcare, labor markets built around the assumption that women would work throughout their adult lives. Daily life organized that way, over enough decades, shifts what feels normal at home.

The countries on the conservative end of these maps (Bulgaria, Romania, Poland, Slovakia) also share strong Orthodox or Catholic traditions. Norris and Inglehart documented a consistent link between religious conservatism and stronger gender role distinctions in Sacred and Secular (Amazon link). Those same countries also largely overlap with the former Eastern Bloc, so working out which factor carries more weight is genuinely difficult.

One question breaks from the geographic pattern. On whether feminism has gone too far, Cyprus leads at 35%, Slovenia follows at 29%, then Spain at 27%. Spain, which records some of the lowest scores in this survey on breadwinner expectations and household decision-making.

Spain is a different case. The country pushed through an unusually large amount of gender legislation in a short period, a sexual consent law in 2022, mandatory gender quotas for party lists in 2023, and various other reforms in between. Laura Nuño Gómez, a political scientist at King Juan Carlos University in Madrid, noted that in Spain “as progress has been faster, the opposition to gender equality policies has also been more intense and animated.” Vox, whose campaign was built substantially around opposing feminist policy, took 12.4% of the national vote in 2023. That political context is probably where the 27% comes from, not from the same conservatism you’d find in Bulgaria or Slovakia. Portugal, worth noting, scores conservatively on financial independence (46%) but records just 5% on this question, the lowest in the EU.

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The map below takes a different angle and shows only non-Abrahamic religions, one per country.

Buddhism fills most of it. Russia is the most substantive case since Kalmykia, Buryatia, and Tuva have had Tibetan Buddhist communities for several hundred years. Across the rest of Europe Buddhism tends to lead by a thin margin through East and Southeast Asian diaspora populations, not because it has especially deep local roots.

The UK and the Netherlands having Hinduism on top makes sense given colonial history and South Asian immigration, but Moldova and Andorra are less obvious. The pattern, once you look into it, is that South Asian communities put down roots in more places than most people would guess, and in countries where almost everyone else is Christian or Muslim, even a moderately sized diaspora can end up leading the non-Abrahamic count. Nine countries in total, with Pew Research putting Europe’s combined Hindu population at roughly 2 million in 2020, up about 30% from the decade before.

Seven countries across the northeast come up Neopagan: Iceland, Estonia, Latvia, Lithuania, Ukraine, Belarus, and Romania. Ásatrú in Iceland goes back to the 1970s as an officially recognized religion and has been growing since. In Lithuania that equivalent is Romuva, in Estonia it’s Maausk, both reconstructions of pre-Christian traditions that the Soviet Union banned. After 1991 a lot of communities in the region started putting those things back together, and some of it moved faster than you might expect.

Zoroastrians were building fire temples on the Absheron Peninsula centuries before Islam arrived in the region. A small community survived the transition and is still present in Azerbaijan—a country that borders Iran.

Turkey has Tengrism, the old religion of the Turkic steppe peoples, predating Islam in the region by a considerable stretch. It’s centered on Tengri as sky deity and treats humans as part of the natural world rather than above it. There’s been a gradual revival tied to interest in pre-Islamic Turkic roots, and in 2022 a Turkish lawyer who wanted to register as Tengrist went through the country’s legal system to make it official, apparently the first person to do that.

Czechia’s leading non-Abrahamic religion turned out to be Jediism in the 2021 census, with 21,539 people filing it as their faith. It started as an organized push in the early 2000s to register protest through official census categories rather than leave the field blank. By 2021 that number had gone up almost 40% from 2011. Czechia also has the highest rate of religious non-affiliation in Europe, somewhere above 70%, so the context for all of this is a country that is mostly just done with the question of religion in a formal sense.

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German-speaking regions had settled on their own system by the mid-15th century: acorns, bells, leaves, and hearts. It’s a visually different world from the Italian suits, more central European in feel, less Mediterranean. Swiss card makers of the same era took acorns and bells from the German system but used roses and shields for the rest, and that particular combination stuck around long enough to still be in use today. Around 1480, French makers took the German system as their starting point and cut it down to the simplest possible format: two colors, four clean shapes. Cards became considerably cheaper to print that way, which had obvious consequences for how widely the format traveled.

Deck structures diverge even more sharply than the suit symbols suggest. Neither the German, Swiss, Italian, nor Spanish traditions include a Queen — that’s a French contribution, and a relatively recent one in the long history of card playing. German and Swiss packs typically run to 32 or 36 cards, with the court made up of a King, Ober, and Unter. Italian and Spanish decks are a different shape altogether: usually 40 cards, three court figures, but with a Knight rather than any kind of knave pair. The French 52-card structure with its King, Queen, and Jack is the youngest of these formats by some distance.

Schafkopf in Bavaria runs on a 36-card German deck, and the game grew around that format over generations in a way that makes the two basically inseparable. Playing it with a standard poker deck runs into problems almost immediately — cards the game depends on simply don’t exist in a French format. Jass in German-speaking Switzerland has that same dependency on Swiss-German cards, and Italian games like Scopa and Briscola grew up around 40-card Latin decks over centuries of play. Regional card formats survived largely because regional games needed them to.

The ranking surprises go beyond court cards. In Briscola and Scopa, the 1 (Ace) outranks the King, which feels completely wrong to anyone whose only reference point is poker or Bridge. German decks have their own history with the Ace: older German packs dropped it entirely by around the 1470s, with the Deuce taking its place as the highest card instead.

The French deck’s global spread had a lot to do with ink costs. Multiple colors were needed to print German, Italian, and Spanish decks properly, while the French system worked fine in just red and black. French and English manufacturers had a real commercial advantage because of this from the 17th century onward. The worldwide reach of Whist, Bridge, and eventually Poker through British and American cultural influence then carried the format into virtually every corner of the world, and the Napoleonic Wars physically moved French-pattern cards into regions where local formats had been the standard for generations.

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They made their forecasts using what’s called medium variant projections. Some countries didn’t even exist yet when they made these – USSR was still around, Yugoslavia hadn’t split up – so those got added later with 1994 data once the new countries actually existed.

35 years later, here we are in 2025. How’d they do?

Western Europe went over most predictions. Eastern Europe came up way short. Luxembourg almost doubled. Andorra lost nearly half.

Luxembourg Went All-In on Banking

Luxembourg had 382,000 people in 1990. The UN said they’d have 361,000 by now. They’ve actually got 680,000. That’s 88% higher than predicted.

Steel was Luxembourg’s thing back in 1990. Then over the next decade or so, the whole country shifted into banking and finance. It became one of Europe’s major financial centers. GDP per capita went higher than anywhere else. If you worked in Brussels and could get a job in Luxembourg, you’d make maybe 30-40% more. People moved there from all over Europe.

The people making forecasts in 1990 were looking at a steel economy. They couldn’t have known it would transform this much.

Greece Got There But Not How They Expected

They predicted Greece would have 10,080,000 people. It’s got 9,938,000 now. That’s only 142,000 off, which is about 1.4%. Best prediction in the whole dataset.

But it didn’t happen the way the model expected at all. They figured the population would keep growing as the economy got better and Greece got more tied into the EU. For a while it did go that way. Tourism was booming, there was construction all over, EU money coming in, the numbers climbing pretty much on schedule.

Then the 2009 crisis hit and it really hurt the country. Youth unemployment went over 50 percent and a lot of young Greeks left for Germany, the UK, Australia, wherever they could find jobs. Birth rates fell sharply. The population dropped again until it landed almost exactly where the old forecast said it would.

Andorra’s Mountain Problem

They thought Andorra would have 153,000 people. It’s got 82,000. Almost half what they predicted.

Andorra did fine economically. It became a tax haven, businesses came in from Spain and France, money flowed. But Andorra’s in a valley with mountains all around it. You can’t just make more valley. Housing got crazy expensive. Young people who grew up there couldn’t afford it anymore and moved to cheaper Spanish and French towns just across the borders.

Now there’s a waiting list to move to Andorra. Application fee is €50,000 and it’s non-refundable. Want to live there without working? You need to invest €1,000,000 in the country. When you run out of space, economic success doesn’t fix it.

Where Eastern Europeans Went

Eastern Europe is where the forecasts went wrong the most. Poland had 38 million people in 1990 and they thought it would reach 45 million but it’s stayed right around 38 million the whole time. Romania started at 23 million, was supposed to get to 25.7 million, and instead fell to 18.9 million. Moldova was 41.6 percent below the forecast, Albania 44.6 percent. Bulgaria, Latvia, Lithuania — the same thing happened there, all of them millions short.

Roughly 25 million people left Eastern Europe for the west between 1990 and 2015. That’s more than Romania has now. The countries with less stable governments and fewer good opportunities lost the most of their younger and educated people who went looking for better pay in Germany, France and the UK. All those people helped push the western numbers higher in ways the 1990 models never included.

Why They Got It Wrong

A lot of this was hard to see coming at the time. The forecasts came out in 1990 just after the Berlin Wall fell and while Germany was reunifying. The Soviet Union held on until the end of 1991.

EU expansion creating freedom of movement between countries with huge wage gaps? Couldn’t see it yet. Wars tearing through Yugoslavia in the 90s? Not predictable from 1990. Luxembourg going from steel to banking? Not obvious. Ireland’s economic boom? Not on the radar.

Birth rates dropped faster than expected, especially in Southern and Eastern Europe. Migration completely reshaped where people actually live.

What’s Predicted for 2050

Eurostat’s 2025 projections have the EU at about 450 million now. They expect it to peak around 453 million near 2026 and then ease back to roughly 448 million by 2050.

The headline number makes it look fairly stable but the differences between countries are big. The European Commission worked out that without any migration the EU would lose about 14 percent of its population by 2050. Migration helps reduce that loss but it doesn’t get rid of it.

Luxembourg, Ireland, Sweden, the Netherlands, France are projected to keep growing. Bulgaria, Lithuania, Latvia keep shrinking – they’ve already lost over 20% from their peaks.

EU fertility averages 1.5 births per woman. You need 2.1 just to maintain population. Even with about a million migrants per year coming in, population still declines because there aren’t enough young people. Demographers call this “negative population momentum.”

Bruegel’s 2024 research shows that between 2023 and 2050, natural population change will average negative 3 per thousand annually. Migration adds 2.6 per thousand. That’s still a net decline.

These 2050 forecasts could easily be as far off as the 1990 ones were. Migration is really hard to predict. Political changes, economic problems, conflicts, climate effects — any of them could cause movements we aren’t expecting. Fertility might go up if policies actually help families or it could drop more if things get harder. Remote work could also change where people want to live.

The post When Demographers Tried to Predict 2025… Back in 1990 appeared first on Vivid Maps.

Take Happy Valley-Goose Bay in Newfoundland and Dublin. Both sit at 53°N latitude, so they’re getting identical winter sunlight. But January temperatures? Happy Valley-Goose Bay averages -22°C. Dublin barely freezes at 2°C. That’s a 24-degree gap between two places that should theoretically have similar winters.

The numbers for other latitudes tell the same story. Quebec’s Sept-Îles freezes at -20°C while Plymouth sits at 4°C. Drop down to 48°N and Rimouski is at -15°C, Brest at 4°C. Even New York, the mildest of the North American cities here, only reaches -3°C. Porto is at 6°C.

All the European cities on the map above stay above freezing. All the North American ones are well below zero.

The Gulf Stream creates this gap. Caribbean water flows northeast and reaches Ireland, Britain, and France still warm enough to change their entire climate. Nothing comparable exists for North America. Arctic air moves south and there’s no warm ocean current moderating anything.

The Gulf Stream itself may be weakening based on climate data from the past few decades. These temperature patterns we map today might not be permanent.

Related Reading:

• Comparing the latitude of Europe and America
• The Hidden Parallels: Northern and Southern Hemisphere Cities at Equal Latitudes
• Find cities with a similar climate

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According to the map above, Greece tops the list. About 1,550 years under Roman rule. The Romans conquered Greece in 146 BC when they destroyed Corinth. Augustus wouldn’t become emperor for another 173 years. After the 395 split, Greece ended up in the eastern empire. The people living there never stopped identifying as Roman. Rhomaioi is what they called themselves in Greek. To them, their empire was simply Rome with a new capital in Constantinople. When you count the Eastern Roman Empire as Rome, Greece was Roman from 146 BC through 1453 AD.

Places like Italy, North Africa, and Asia Minor stayed Roman for 500 to 1,000 years. Latin changed over those centuries. In some regions it evolved into French, in others into Spanish, Italian, Portuguese, Romanian. Roman law sank deep roots. Building methods spread and stuck around.

North England got maybe 50 years of Roman rule. Germania had similar short stints. Same along the Danube frontier. Legions arrived, threw up roads and military camps, then pulled back when costs got crazy or locals fought too hard. Dig around those places and you’ll find Roman stuff, but the cultural footprint stayed pretty thin.

Rome left marks that lasted way past the empire itself. Eastern Roman legal codes influenced law in Europe, Russia, and Latin America. After Constantinople fell, scholars took their manuscripts and ran west. What they brought helped spark the Renaissance in Italy. Roman engineering shows up in buildings we construct today. Romance languages descended from Latin get spoken by close to a billion people.

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Jordi Martí-Henneberg, a geographer from the University of Lleida in Spain, poured a ton of time into creating this big database that tracks Europe’s rail networks from 1840 up until 2010.

Mapping it all wasn’t straightforward at all, what with borders in Europe getting reshuffled so often—especially in that rough patch from 1914 to 1950. He broke down his approach in a 2013 paper from the Journal of Transport Geography.

A few years later, he followed up with a 2021 article in Social Science History, where he featured maps for specific years, including 1850, 1910, 1930, and 2000.

1850: The Early Phase

Britain and Belgium led. Their industrial centers already had well-developed railway systems connecting major cities. Many German states (Germany wasn’t unified yet) had also built substantial networks. France had started construction but the lines were disconnected from each other.

Beyond that, coverage was sparse. Spain and Portugal had only a few lines. The Balkans had almost nothing. Scandinavia was just getting started. Most of Eastern Europe was still using roads, rivers, and horses for transport.

Mountain ranges blocked connections. The Alps separated Italy from countries to the north. The Pyrenees isolated Spain and Portugal. Large areas had no rail access at all.

1910: The Peak

Sixty years later, railways covered nearly the entire continent. Scandinavia had extensive networks. Southern Europe was well-connected. Territories divided between the German, Russian, and Austrian empires (later to become Poland) all saw heavy railway construction, though each empire followed different plans.

Most countries connected their networks across borders. Geography blocked some connections (mountains), and politics blocked others. Bulgaria and Romania hardly connected their systems because they didn’t trust each other.

Governments built railways primarily to integrate their own territories. The combined result was a system spanning the continent. You could travel from Portugal to Poland or from Scotland to Sicily (though crossing the Alps took effort).

This was the high point. Europe never had denser railway coverage than in 1910.

The political map looked stable. It wasn’t. Within a decade the Austro-Hungarian Empire would collapse. So would the German Reich. Ottoman lands in the Balkans would be divided into new countries. World War I was coming.

1930: New Borders, Old Railways

By 1930, railway density remained similar but the political landscape had completely changed.

Poland became independent again after being partitioned for over a century. The problem was its railways. Three empires had built them with three separate strategies. Areas under former Russian control still have noticeably thinner coverage than sections built under German administration. Current railway maps still show this imbalance.

Yugoslavia and Czechoslovakia ended up with railways built for empires that had collapsed. Border stations that used to handle lots of international traffic became just another stop inside the country.

2000: Dismantling the Network

The 2000 map shows less railway infrastructure than 1910. Thousands of kilometers were removed.

Western Europe cut the most. Britain, France, Belgium, and Germany all closed massive amounts of track. After 1950, car ownership grew quickly. Roads improved. Branch lines serving smaller towns lost passengers. Governments examined the costs and began shutting lines down.

This happened across nearly all of Europe, but the biggest reductions came in countries where the original networks had been densest.

High-speed rail changed the picture starting in 1981. France built TGV lines. Spain developed AVE routes. Germany added ICE service. These were selective though, connecting major cities rather than providing the comprehensive local coverage that existed in 1910.

Today, Europe’s rail system is evolving again, with a push toward sustainability and high-speed connections to combat climate change.

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The Gulf Stream brings warm water northeast from the tropics, so London is milder than Calgary even though it is farther north. Mountains like the Alps and Pyrenees block weather systems, creating wet slopes on one side and dry rain shadows on the other. Your distance from the Atlantic or Mediterranean determines whether you get maritime moderation or the wild temperature swings of a continental interior. Latitude controls how much sunlight reaches you. Latitude affects how much sunlight you get.

These patterns aren’t staying put. I made maps showing how European climate zones have moved since 1930 and where they’re going by 2099. The data comes from Beck et al. (2023) at 1-kilometer resolution. A general northward migration is the current trend. For climate codes and their meanings, check my earlier post on global classifications.

Today’s map shows what most Europeans recognize. According to the map, Portugal’s coast is surrounded by a Mediterranean climate (Csa, Csb). Oceanic climate (Cfb) blankets Britain, Ireland, France, Western Germany, and the Atlantic-facing coasts. Northern Italy and parts of the Balkans get humid subtropical (Cfa). Central and eastern Europe from East Germany through Poland and into Russia have humid continental (Dfb). Northern Scandinavia and Russia have subarctic (Df). The Alps, Pyrenees, and Carpathians hold cool mountain climates (Cfc) with tundra patches (ET) on the highest summits. Spain’s interior plateau and areas around the Black Sea and Caspian Sea show semi-arid zones (BSk).

A Century of Northward Movement

Climate zones have been on the move for decades.

The early 1900s (1901–1930) versus today (1991–2020).

The Mediterranean climate has shifted north into southern France and expanded in the Balkans. Oceanic zones have moved into areas that used to be more continental. Humid continental climates have shifted northeast. Subarctic zones in Scandinavia have pulled back northward. Mountain tundra has retreated to higher elevations.

Projections to Century’s End

For the future, I used the most possible SSP2-4.5 scenario where emissions plateau by mid-to-late century.

Today versus late this century (SSP2-4.5).

By 2099, the movement speeds up. The Mediterranean climate extends deep into southern France and spreads into more of the Balkans and Spain’s interior. Humid subtropical zones expand northward from Italy and the Balkans toward Poland. Continental climates shift further northeast, with cooler variants pushed into areas that are currently subarctic. Subarctic zones retreat dramatically in Scandinavia and Russia. Mountain tundra disappears from all but the highest Alpine peaks. The UK and Ireland see their oceanic climate become warmer. Some southern European areas cross from Mediterranean into semi-arid steppe.

From 1930 through 2099.

Over this timespan, climate zones migrate hundreds of kilometers northward. In 1930, Mediterranean stayed on the Mediterranean. By 2099, it’s in southern France. What was oceanic becomes Mediterranean. What was continental becomes oceanic. What was subarctic becomes continental. Some areas that were Mediterranean become semi-arid as temperatures rise and precipitation patterns shift.

The coldest zones contract toward the Arctic coast or disappear. This changes agriculture, water supplies, forests, and what kinds of buildings you need. Wine regions migrate north. Forests adapted to cooler conditions struggle with heat. Rivers change when they flood. Buildings designed for one climate face another. Species that need specific conditions either lose habitat or expand their ranges.

I made maps for 1931–1960 and 2041–2070 too. The full sequence:

Data and Methods: Maps use the 1 km Köppen-Geiger dataset from Beck, H.E., et al. (2023), “High-resolution (1 km) Köppen-Geiger maps for 1901–2099 based on constrained CMIP6 projections,” Scientific Data 10, 724 (https://www.nature.com/articles/s41597-023-02549-6).

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The idea of a shared European currency had been discussed for many years, but it only began to take real form toward the end of the twentieth century. Attempts in the 1970s to keep currencies stable were quickly undone by inflation and political uncertainty. It took a different generation of leaders and a stronger, more integrated European Union to move the plan forward finally. The Maastricht Treaty, signed in 1992, set the groundwork for creating a single European currency and outlined the framework that would become the Economic and Monetary Union.

Three years later, in December 1995, European leaders meeting in Madrid agreed to call the new currency the ‘euro’ (ECB). They settled on it because it was short, neutral, and worked easily in every European language. Soon after, the first designs for notes and coins were approved — images of arches and bridges meant to stand for openness and unity rather than any single country or culture.

The euro came into existence on 1 January 1999, though at first it was used only electronically. Banks and companies began working with it immediately, even while people still handled their old national currencies day to day. On that first day, eleven countries joined together: Austria, Belgium, Finland, France, Germany, Ireland, Italy, Luxembourg, the Netherlands, Portugal, and Spain. Their exchange rates were fixed definitively to the euro, ending decades of national currency fluctuations.

Greece joined soon after, in 2001. When euro coins and banknotes were introduced in January 2002, it was one of the largest financial transitions in modern times. ATMs were updated overnight, shop prices adjusted, and millions of people started using the new currency almost immediately. In the years that followed, the euro area kept expanding — Slovenia joined in 2007, Malta and Cyprus in 2008, Slovakia in 2009, and, most recently, Croatia in 2023.

Former Currencies and Euro Adoption Timeline

The European Central Bank has noted that the euro made trade simpler, encouraged price transparency, and lowered the cost of exchanging money (ECB). But the single currency also brought challenges. Countries that joined gave up certain tools for managing their own economies, such as the power to adjust interest rates or devalue their currency in hard times. When the global financial crisis hit in 2008, the loss of flexibility made recovery more difficult for several members.

Even with those difficulties, the euro soon became part of daily life. Today it’s used by more than 340 million people across 20 countries, and several nations outside the EU keep it in their reserves. What began as a daring political idea has grown into one of the world’s most stable and widely trusted currencies — a lasting example of how much Europe has accomplished together.

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