Industrialization began pushing species toward extinction in the mid-to-late 1800s, but the sharpest surge came after 1950. That post-war period, sometimes called the Great Acceleration, saw extinction rates climb to at least tens to hundreds of times higher than the natural background rate that held steady for the previous 10 million years. The story isn’t one single turning point but a ratcheting up of pressure across two centuries.
The First Wave: 1850 to 1950
The earliest industrial-era extinctions were driven by a simple formula: new technology made it possible to kill animals faster than they could reproduce, and expanding markets made it profitable to do so. Steam-powered ships, railroads, and mechanized processing turned wildlife into raw material at a scale that pre-industrial societies could never achieve.
The passenger pigeon is the most dramatic example. Once numbering in the billions across North America, the species was wiped out by commercial hunting operations that used railroads to ship millions of birds to urban markets. The last known passenger pigeon died in the Cincinnati Zoo in 1914. The Carolina parakeet, the only parrot native to the eastern United States, was shot as an agricultural pest and captured for the pet trade until it disappeared around 1920. The sea mink, hunted for its pelt by the growing fur industry, was gone by the 1890s. The heath hen, decimated by hunting and habitat loss as human settlement expanded, held on until 1932.
These extinctions shared a common thread: industrial-scale harvesting combined with habitat conversion as agriculture and cities spread across formerly wild land. But at this stage, the damage was largely regional. The truly global acceleration was still to come.
Industrial Whaling and the Oceans
What happened to whales illustrates how rapidly industrial technology can overwhelm even the largest animals on Earth. In the 1860s, a Norwegian whaler named Svend Føyn introduced the steam-powered whale catcher and the exploding harpoon gun. By the early 1900s, modern whaling was well established in the Northern Hemisphere, and by 1909, operations south of the equator had surpassed those in the north.
After World War I, whaling fleets turned to previously unexploited stocks of large rorqual whales (blue, fin, and sei whales) that older wooden boats had been too slow to chase. The killing was so intense that by the late 1920s, members of the League of Nations declared that whales needed “urgent international measures” to prevent extinction. Species-by-species bans followed: commercial bowhead whaling ended in 1931, right and gray whales were protected in 1935, blue whales in 1966. A global moratorium didn’t pass until 1982, after industrial fleets had spent the better part of a century working through one population after another.
There is no evidence that human impact on the marine biosphere, as measured by the tonnage of fish pulled from the sea, was anywhere near late-20th-century levels at any point earlier in human history.
The Great Acceleration After 1950
The period after World War II changed everything. Energy use, economic output, urbanization, and chemical fertilizer production all surged simultaneously, and the pressure on living systems followed the same steep curve. Researchers studying long-term Earth system data have described the post-1950 shift as unlike anything in the previous 11,700 years of relatively stable climate and ecology. As one research team put it, the dramatic change in the magnitude and rate of the human imprint from about 1950 onward was beyond what anyone expected.
Several industrial forces converged. The Haber-Bosch process, invented in the early 1900s to manufacture synthetic fertilizer from atmospheric nitrogen, massively altered the global nitrogen cycle over the following decades. Excess nitrogen washed into rivers and coastal waters, creating dead zones where aquatic life couldn’t survive. Meanwhile, the rise of carbon dioxide in the atmosphere tracked closely with the rise in energy use and economic growth, with no sign of decoupling between the two. Tropical forests, which harbor the majority of terrestrial species, bore the brunt of new land conversion as older agricultural frontiers slowed. What land was converted in recent decades came mainly at the expense of those forests.
The numbers tell the story plainly. Under natural conditions, the background extinction rate for vertebrates (mammals, birds, fish, reptiles, and amphibians) runs about 1.8 extinctions per million species per year. At that rate, roughly nine vertebrate species should have gone extinct during the entire 20th century. In reality, 390 vertebrate species disappeared since 1900, more than 40 times the expected number.
Where Things Stand Now
The IUCN Red List, the most comprehensive global inventory of species health, has assessed more than 172,600 species to date. Of those, more than 48,600 are currently threatened with extinction, about 28 percent of all species evaluated. That number continues to grow as more species are assessed and as industrial pressures intensify in tropical and marine ecosystems.
According to estimates compiled across more than 130 countries for the global biodiversity assessment (IPBES), current extinction rates are at minimum tens to hundreds of times higher than the average over the past 10 million years. Many of those extinctions are projected to occur within the coming decades, not centuries, because the species in question are already in steep decline.
Why the Timeline Matters
The distinction between pre-1950 and post-1950 extinction pressures isn’t just academic. The early industrial extinctions were driven primarily by direct killing: hunting, trapping, harvesting. The post-1950 surge added systemic, harder-to-reverse drivers: climate change from fossil fuel combustion, chemical pollution of waterways, nitrogen overload in ecosystems, and the wholesale conversion of tropical forests. These forces don’t just remove individual species. They degrade entire habitats, pushing thousands of species toward thresholds simultaneously.
The trajectory of industrial growth and biodiversity loss have moved in lockstep for 75 years, and the data show no sign yet of that relationship breaking apart. The last 50 years represent, by any measure, the most rapid transformation of the human relationship with the natural world in the history of our species.