For most of human history, our ancestors spoke a dazzling array of tongues. But a new study in the journal Science suggests that this linguistic richness peaked surprisingly late—only a couple of millennia ago—and then collapsed as empires and states consolidated power. The languages we hear today are the survivors of a brutal bottleneck.
Researchers led by Claire Bowern at Yale University analysed the linguistic diversity of 171 contemporary hunter-gatherer communities and used statistical models to project backwards. Their estimates indicate that around 12,000 years ago, when the global population was under 7 million, between 4,500 and 6,200 distinct languages were spoken. That number then grew steadily for thousands of years as human populations expanded and migrated.
A golden age of speech
The study identifies a 'golden age' of linguistic diversity between roughly 1,000 and 3,000 years ago, when tens of thousands of languages coexisted across the planet. This peak, the authors say, is far more recent than previously assumed. "The highest level of linguistic diversity may not have occurred in the distant Palaeolithic, as is often assumed, but in the period when states grew and the first empires emerged," Bowern noted.
That timing is crucial. It suggests that the very forces that built civilisation—agriculture, urbanisation, and political centralisation—also began to erode the world's linguistic fabric. The expansion of multi-ethnic states and large empires absorbed smaller communities, imposing dominant languages and gradually silencing local ones.
According to the study, the decline began about 2,000 years ago and accelerated sharply, with the number of languages dropping 'as if falling off a cliff'. The Age of Empires, which started around 4,000 years ago, did not initially reduce diversity, but the intensification of state power eventually took a heavy toll.
Colonialism's lasting damage
Colonialism stands out as a key driver of language loss in recent centuries. The study notes that more than 400 languages have vanished completely in the past 50 years alone. Legal prohibitions, violence, and forced assimilation have all played a part, alongside economic pressure to adopt dominant languages such as English and Spanish.
A poignant example is the N|uu language of the Kalahari Desert in southern Africa. The division of indigenous territories by national borders fractured the communities that spoke it, and today only one fluent speaker is thought to remain. Similar stories unfold across Europe's former colonies and beyond.
In Europe itself, the legacy of state-building and nationalism has also taken its toll. Languages like Breton, Occitan, and Sorbian have been marginalised for generations, though recent revitalisation efforts have brought some back from the brink. The study's findings resonate with ongoing debates about linguistic rights and cultural heritage across the continent.
Today, around 7,500 languages are spoken worldwide—a figure higher than the estimated number 12,000 years ago, but far below the tens of thousands at the peak. Data from the Endangered Languages Project indicates that roughly 3,300 of these are seriously threatened, with 437 critically endangered.
The researchers argue that the trend is largely irreversible. Once a language disappears, it rarely returns. However, they point to successful revival efforts, such as Hebrew in Israel and Welsh in the UK, as proof that determined communities can reverse the decline—if political will and resources are available.
For Europe, where linguistic diversity is both a cultural treasure and a political challenge, the study offers a stark reminder of what is at stake. As the continent grapples with migration, regional identities, and the dominance of English, the fate of its smaller languages may depend on the choices made in Brussels, Berlin, and beyond.
