The Half Earth(ling)

Renowned Entomologist Edward O. Wilson Calls for Conserving Half the Planet for Biodiversity

In nearly a century of living and studying living things, entomologist Edward O. Wilson has undoubtedly seen more ants than the busiest professional bug exterminator.

As a teenager, Wilson reported the first known colony of imported red fire ants in his home state of Alabama. Later, he studied the warrior-like Matabele ants in Africa, the critically endangered Aneuretus simoni in Sri Lanka, and thousands of other species. Several of his 32 books focus on the ant world, including The Ants, which won a Pulitzer Prize, and his only work of fiction, Anthill: A Novel.

Jane Goodall and Edward O. Wilson spoke for about an hour at the Esri UC.

So placing the words ants and exterminator together in an article about Wilson could strike a nerve among people with an affinity for ants. But when people ask Wilson—honorary curator in entomology and university research professor emeritus at Harvard University—what to do with ants that invade their houses, he always handles their questions with grace and good humor. (Read more about that and Wilson’s major discovery in this story’s sidebar.)

Wilson, 90, recently ventured from his studies of ants and ecosystems to attend the 2019 Esri User Conference (Esri UC) in San Diego, California. There, he spoke about something that is just as near and dear to him as insects are: protecting biodiversity around the world through the Half-Earth Project, an initiative of the nonprofit E.O. Wilson Biodiversity Foundation.

The Half-Earth Project advocates conserving half the earth’s lands and seas in order to protect 85 percent or more of the planet’s biodiversity to reverse the current species extinction crisis. That includes ants, of course. According to Wilson, there may up to 10 million species of plants and animals in the world, but only about 2 million have been discovered by science.

“I want us to create a system of natural reserves or specially managed areas large enough to save—indefinitely, in natural conditions—a very large percentage of the species on earth,” Wilson said onstage at the Esri UC Plenary Session.

Wilson authored Half-Earth: Our Planet’s Fight for Life, from which the Half-Earth Project was born. He is 100 percent in on the Half-Earth Project because of what he described as the “three great environmental crises” that loom: climate change, a shortage of fresh water, and a collapse of ecosystems due to a mass extinction of species.

“The sooner we face [these issues] squarely and honestly, the more likely we will be able [to solve] them at minimal cost,” he said.


Edward O. Wilson encourages people to go outdoors and collect insects. Photo courtesy of the Half-Earth Project.

Wilson joined Esri president Jack Dangermond and Jane Goodall, DBE, founder of the Jane Goodall Institute, for a wide-ranging discussion titled “The Importance of Biodiversity Conservation at a Global Scale.”

Wilson said that he and a colleague—an ecologist and mathematician—at Princeton University developed the formula for the Half-Earth calculations.

“If we can set aside half of the earth’s surface, and especially if it includes the beautiful natural areas that we’ve held onto, then we can save a very large percentage of all the species on earth indefinitely,” said Wilson. “This brings with it a chord of hope. I’m happy to tell you that the Half-Earth proposal has become an initiative, and I think it has been pretty well  accepted by conservation organizations and activists around the world.”

“The Little Things That Run the World”

Esri is partnering with the E. O. Wilson Biodiversity Foundation to identify and map the world’s known species at a highly detailed level. That information can then be used to help prioritize areas for conservation.

Esri’s contributions will include technical  expertise, ArcGIS technology, and financial support. The Half-Earth Project, in collaboration with Esri, plans to develop a global map of species distributions at 1 km resolution within the next five years.

With most species yet to be discovered, Wilson said he would like to see science focus more on the tiniest organisms among us such as oribatid mites, springtails, and nematodes.


Wilson is a renowned expert on ants. Photo courtesy of the Half-Earth Project.

“Pay attention to what I call the little things that run the world,” Wilson said. “Being big mammals, we are focused on the creatures most like ourselves. At the same time, we are going to have to develop a lot of science that reaches down into the smaller organisms . . . to the millions of species of insects, of creatures most people have never heard of, that are nonetheless fundamental in maintaining these ecosystems, [ranging from] the cornfields to the cacao plantations.”

Much more data on plant and animal species needs to be collected, both by scientists and citizen scientist volunteers, according to Wilson. He recently celebrated his 90th birthday by participating with taxonomic specialists, students, families, and other community members in the Great Walden BioBlitz at Walden Woods in Massachusetts. Wilson made a special point of spending time with a group of children collecting samples of organisms, including ants.

Inspired Mapping and Analysis

Analyzing and mapping information collected on plants and animals are essential to the success of the Half-Earth Project, from setting conservation priorities to developing a better understanding of organisms and how they operate within ecosystems, according to Wilson.

“This entails a tremendous amount of inspired mapping and analysis—not only where the biodiversity is, because this is crucial for saving it as a whole, but also where the species are and in what places they create ecosystems of a certain kind, which we can study and figure out how it all works,” he said.

The Half-Earth Project has launched the Half-Earth Map, which leverages geographic content from Esri’s ArcGIS Living Atlas of the World. Upon opening the app, people can select from a list of species (e.g., amphibians, birds, cacti, conifers, mammals, hummingbirds, and turtles) and see, on a map of the world, where these groups are abundant and where they are rare.

“You have got to know all the different organisms and where they are found,” Wilson said during an interview that followed his talk. “There will be places where there will be, for one reason or another, little biodiversity. But then there will be places where it’s extremely rich. If you use the Half-Earth plan, what you want to do is make sure as many of the species-rich areas [as possible] are in the half that is preserved.”

The Importance of Biodiversity

Wilson defines biodiversity as “the totality of inherited variation among species” that exists in three levels of biological organizations: ecosystems, species, and genes.

“An ecosystem is just a conglomerate of interacting species that are depending, to some extent, upon [each other’s] survival and reproduction,” he said. “A species is a population or a series of populations of organisms that freely interbreeds with one another or are capable [of doing so] . Genes prescribe the traits of the species that form the ecosystems.”

Right now, Wilson’s research focus is on ecosystems. Little research has been done on them. But their importance is inescapable.

Wilson likes to use the example of the ecosystem of the sea otter, which was hunted to near extinction on the Pacific coast by the early 1900s. When the sea otter population fell, the kelp forests along the coast disappeared too. That threw an entire ecosystem off kilter.

“The kelp forest of seaweed and algae along the coast declined and, in places, disappeared,” Wilson said. “What had happened? The sea otter fed upon sea urchins that live in kelp forests. The sea otter was the [urchins’] main predator. The sea urchins exploded in population. They did not have their predator that kept them in control. There were so many of them that they ate the kelp. ‘Sea urchin barons,’ they [were called]. When sea otters were allowed to come back—hunting was forbidden—then the sea otters reduced the numbers [of sea urchins], and now the kelp is coming back.”

Wilson said not much is known about ecosystems, but he hopes to change that. “What I am doing right now is to begin systematic studies, deep studies, mathematical studies of ecosystems,” he said. “It’s so complex, nobody understands them.”

He wants to find out how ecosystems are formed, how they evolve, and then how they equilibrate. “A pine forest has been there for a thousand years. How did [the trees] come to a point where they don’t change much?” he asked.

It’s a tall order, but Wilson is never one to slow down. “I’m 90 now, so I’ve got to get this done before I pass on to that great rainforest in the sky,” he said with a smile.

For more information about the Half-Earth Project, visit

Learn more about how Esri is supporting the Half-Earth Project.

Watch Wilson’s complete conversation with Jane Goodall and Jack Dangermond at the Esri UC.

About the author

Carla Wheeler is a former technology writer and editor at Esri and a former newspaper journalist. She graduated from the University of Minnesota with a Bachelor of Arts degree in journalism and political science. She was the previous editor of ArcWatch and worked with ArcGIS StoryMaps apps. Follow her on Twitter @gisjourno.