Paul R. Ehrlich facts for kids

Quick facts for kids Paul R. Ehrlich
Ehrlich in 1974
Born	Paul Ralph Ehrlich (1932-05-29)May 29, 1932 Philadelphia, Pennsylvania, U.S.
Died	March 13, 2026(2026-03-13) (aged 93) Palo Alto, California
Education	University of Pennsylvania (BA) University of Kansas (MA, PhD)
Known for	The Population Bomb (1968) Simon–Ehrlich wager
Spouse(s)	Anne Howland ​ (m. 1954)​
Children	1
Awards	Crafoord Prize (1990) Heinz Awards (1995, with Anne H. Ehrlich) Tyler Prize for Environmental Achievement (1998) Fellow of the Royal Society (2012)
Scientific career
Fields	Entomology Population studies
Institutions	Stanford University
Thesis	The Morphology, Phylogeny and Higher Classification of the Butterflies (Lepidoptera: Papilionoidea) (1957)
Doctoral advisor	C. D. Michener

Paul Ralph Ehrlich (born May 29, 1932) was an American biologist, writer, and environmentalist. He was known for his strong warnings about the effects of a growing human population. These effects included concerns about widespread hunger and running out of natural resources. Mr. Ehrlich was a professor at Stanford University. He became very well known for his book The Population Bomb, which he wrote with his wife, Anne H. Ehrlich, in 1968. In this book, they shared their worries that many people would face starvation if the world's population kept growing too fast.

People have had different opinions about Mr. Ehrlich's ideas. Some experts agreed with his concerns about population and the environment. Others criticized his predictions, saying they were too negative and did not always come true. Mr. Ehrlich believed that while population growth was slowing, wealthy countries using too many resources was still a big problem. He also felt his warnings about diseases and climate change were correct. Paul Ralph Ehrlich passed away on March 13, 2026, at the age of 93.

Who Was Paul Ehrlich?

Early Life and Education

Paul Ehrlich was born in Philadelphia, Pennsylvania, in 1932. His father sold shirts, and his mother was a teacher who loved Greek and Latin. When he was a child, his family moved to Maplewood, New Jersey, where he finished high school in 1949.

A Career Studying Nature

Ehrlich around 2010

Mr. Ehrlich studied entomology, which is the study of insects. He especially loved Lepidoptera, which are butterflies. He earned his bachelor's degree in zoology from the University of Pennsylvania in 1953. He then received his master's and PhD degrees from the University of Kansas. His PhD research was all about the different types of butterflies.

During his studies, he traveled to places like the Bering Sea and the Canadian arctic to study insects. He also researched the genetics and behavior of tiny mites. In 1959, he started teaching at Stanford University. He became famous for helping to explain the idea of coevolution. This is when two different species, like plants and insects, evolve and change together over time, influencing each other. He became a full professor of biology in 1966. In 1984, he started the Center for Conservation Biology at Stanford. This center helps protect different kinds of plants and animals.

Ideas About Population Growth

Graph showing changes in global human population since 10,000 BC

Since the 1950s, the rate of population growth has slowed down.

In 1967, Paul Ehrlich gave a speech about the world's growing population. This speech became very popular and led to the idea of writing a book. He worked with his wife, Anne H. Ehrlich, on the book, which was called The Population Bomb. However, the publisher decided to list only Paul's name as the author.

Many people were already worried about population issues in the 1950s and 1960s. But Mr. Ehrlich was very good at talking to the media. He appeared on TV shows many times, which helped make the topic of population growth well-known to a lot of people.

The Population Bomb Book

What the Book Said

The book The Population Bomb started with a very strong statement. It said that the fight to feed everyone was already lost. It predicted that hundreds of millions of people would starve in the 1970s. Mr. Ehrlich believed that the human population was too large. He argued that this would lead to severe hunger, the spread of diseases, and other big problems.

He suggested different ways to manage population growth. He wrote that countries should encourage smaller families.

Years later, many of the book's specific predictions did not happen. This led to more discussions and criticisms. Some critics said his predictions were too extreme. Others worried that his ideas could lead to governments having too much control over people's family decisions. Mr. Ehrlich and his wife, however, continued to believe that their main message was correct.

Later Thoughts and Updates

In 1990, the Ehrlichs wrote another book, The Population Explosion. They argued that the problems they warned about in their first book were indeed happening. They said that hunger was widespread and that famine and disease were becoming more likely. While many agreed that population issues were important, some critics felt the book sounded too alarming.

In a paper from 1994, the Ehrlichs discussed what they thought was the "best size" for the human population. They talked about creating social policies to influence how many children families had.

Ehrlich speaking in 2008

After the year 2000, Mr. Ehrlich continued to talk about his predictions. In a 2004 interview, he admitted that some of his specific forecasts had not come true. However, he said he felt "little embarrassment" and still believed that overpopulation was a major problem. He pointed out that many science groups agreed with his general view. He also said that his warnings about disease and climate change were largely correct.

In 2011, when the world's population reached seven billion, Mr. Ehrlich argued that future population growth would cause even more environmental harm. This was because people would need to use more difficult-to-reach resources. He continued his research on population and resource issues. He focused on protecting endangered species, understanding how human cultures change, and preserving genetic diversity. He also studied how to make areas where humans live more friendly to biodiversity.

Mr. Ehrlich maintained his belief that the human population is too large. He felt it was a direct threat to human survival and the planet's environment. In 2018, he stated that the ideal population size for Earth was between 1.5 and 2 billion people. In 2022, he contributed to a "Scientists' warning on population." This warning suggested a sustainable population would be between 2 and 4 billion people.

How People Reacted to His Ideas

Criticisms and Debates

Wheat yields grew quickly in Least Developed Countries after 1961.

During the 1960s and 70s, many experts shared concerns about population growth. However, over the years, critics have disagreed with Mr. Ehrlich's main ideas about overpopulation. They also questioned his specific predictions.

A common criticism was that his predictions often did not come true. For example, in 1970, he warned that most animal life in the sea would be gone in ten years. He also predicted that by the year 2000, the United Kingdom would be a small group of poor islands with many hungry people. When these things did not happen, he explained that predicting the future is hard. He said that while he might have been wrong about specific timelines, the underlying problems were still real.

Mr. Ehrlich also wrote in The Population Bomb that India could not feed many more people by 1980. He even suggested cutting off emergency food aid to India. However, India's food production greatly increased thanks to new farming methods, even as its population grew.

New farming methods and slower population growth have helped prevent widespread hunger, despite concerns.

Some critics, like journalist Dan Gardner, argued that Mr. Ehrlich was not always honest about his mistakes. Gardner said that Ehrlich took credit for predictions that seemed right, like the rise of AIDS or global warming. But he did not always admit when his other predictions, like massive starvation, were wrong. Gardner believed this showed that Mr. Ehrlich found it hard to accept his own errors.

The Bet with Julian Simon

In 1980, an economist named Julian Simon disagreed with Mr. Ehrlich. Simon believed that human creativity would always find solutions to resource problems. He argued that over time, the prices of most resources had actually gone down. This led to the Simon–Ehrlich wager, a bet between them. Mr. Ehrlich chose ten resources, mostly metals, that he thought would become scarce and more expensive over ten years. However, he lost the bet because the average price of these resources actually decreased.

Other Important Work

Paul Ehrlich helped start a group called Population Connection (originally Zero Population Growth) in 1968. This group works to educate people about population issues. He also served on the board of advisers for other organizations focused on population and environmental concerns.

Mr. Ehrlich also spoke at conferences about desertification, which is when fertile land turns into desert. He believed that people who truly cared about the environment should have smaller families.

Personal Life

Paul Ehrlich married Anne H. Howland in December 1954. They had one daughter, Lisa Marie. After his daughter was born, he decided not to have more children.

Death

Paul Ralph Ehrlich passed away on March 13, 2026, due to complications from cancer. He was living in a retirement community in Palo Alto, California. His daughter confirmed his passing.

Awards and Honors

• The John Muir Award of the Sierra Club
• The Gold Medal Award of the World Wildlife Fund International
• A MacArthur Prize Fellowship
• The Crafoord Prize, considered a top award in ecology
• ECI Prize winner in terrestrial ecology, 1993
• A World Ecology Award from the International Center for Tropical Ecology, University of Missouri, 1993
• The Volvo Environmental Prize, 1993
• The United Nations Sasakawa Environment Prize, 1994
• The 1st Annual Heinz Award in the Environment (with Anne Ehrlich), 1995
• The Tyler Prize for Environmental Achievement, 1998
• The Dr. A. H. Heineken Prize for Environmental Sciences, 1998
• The Blue Planet Prize, 1999
• The Eminent Ecologist Award of the Ecological Society of America, 2001
• The Distinguished Scientist Award of the American Institute of Biological Sciences, 2001
• Ramon Margalef Prize in Ecology of the Generalitat of Catalonia, 2009
• Fellow of the Royal Society of London 2012
• 2013 BBVA Foundation Frontiers of Knowledge Award in Ecology and Conservation Biology

Books and Papers

Books

See Also

• Demography
• Population Connection (formerly Zero Population Growth), a non-profit founded by Ehrlich
• Moral panic
• Netherlands fallacy
• Escape and radiate coevolution