A model led by Yale linguist Claire Bowern estimates global language diversity peaked at 20,000 to 75,000 languages about 1,000 to 3,000 years ago before falling sharply.
The team inferred earlier language counts from more than 170 modern foraging groups, assuming a roughly one-language-per-group pattern that likely prevailed before agriculture spread 12,000 years ago.
Using a starting point of roughly 4,500 to 6,200 languages among 4.4 million to 7 million people, the simulations suggest farming first expanded diversity, but population growth outpaced language splitting.
The later collapse aligns with agricultural intensification and the rise of large states such as the Greek and Roman empires, challenging theories that diversity peaked before farming or that the main extinction crisis began only 500 years ago.
The findings land as about half of today's 7,500 languages are endangered and roughly four disappear each year, underscoring efforts to document what remains.
Did ancient farming and powerful empires silently wipe out tens of thousands of human languages long before modern colonialism began?
If human progress historically triggered mass language extinction, can modern revitalization efforts reverse this trend before thousands more vanish forever?
The 12,000-Year Bottleneck: How Empires and Modernity Erased Tens of Thousands of Human Languages
Overview
This report reveals that global language diversity reached a prehistoric 'golden age' between 1,000 and 3,000 years ago, when tens of thousands of languages flourished due to human expansion and isolation after the rise of agriculture. As societies grew larger and empires emerged, dominant languages spread and absorbed smaller ones, causing a long-term decline in linguistic diversity. Today, only about 7,500 languages remain, and up to half are at risk of disappearing within a century. The loss of languages means the loss of unique cultural knowledge, traditional ecological wisdom, and community well-being, highlighting the urgent need for preservation and revitalization efforts.