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Schoonzoon Rene Beyers, bioloog in Canada, zette dit op Facebook

The new challenge, as Wilson sees it, is to link up national parks and wilderness reserves and restored landscapes to “protect in perpetuity entire faunas and floras.” He has high praise for several such projects out West—especially the Yellowstone-to-Yukon initiative to join vast areas of the U.S. and Canada, and the even more extensive Western Wildway vision, a tri-national arc of land along the length of the Rockies from Mexico to Alaska sponsored by the Wildlands Network, a consortium of biologists and activists headquartered in Seattle.

In early sketches of some proposed “cores and corridors” systems, the connecting corridors look thin and spindly, like brain cells yoked together by the wiring of narrow, protruding axons. Even the word “corridor” sounds restrictive and unwelcoming, conjuring up images of school and hospital hallways, non-places for hurrying along or skulking through on the way to where you’re really going. Davis’ new longleaf corridor had to be more than just a pass-through place. In a hotspot where so many species are so densely crowded together, each rewilded acre had to be a stopping place, as well—a haven and a highway.

Wilson, 85, is the author of more than 25 books, many of which have changed scientific understanding of human nature and of how the living part of the planet is put together. Known as the father of sociobiology, he is also hailed as the pre-eminent champion of biodiversity: Wilson coined the word “biophilia” to suggest that people have an innate affinity for other species, and his now widely accepted “theory of island biogeography” explains why national parks and all confined landscapes inevitably lose species. He grew up in and around Mobile, Alabama, and has been at Harvard for over 60 years but still calls himself “a Southern boy who came north to earn a living.” He is courtly, twinkly, soft-spoken, has a shock of unruly white hair, and is slightly stooped from bending over to look at small things all his life—he’s the world’s leading authority on ants. Wilson has earned more than a hundred scientific awards and other honors, including two Pulitzer Prizes. And perhaps his most urgent project is a quest to refute conservation skeptics who think there isn’t enough left of the natural world to be worth saving.

Throughout the 544 million or so years since hard-shelled animals first appeared, there has been a slow increase in the number of plants and animals on the planet, despite five mass extinction events. The high point of biodiversity likely coincided with the moment modern humans left Africa and spread out across the globe 60,000 years ago. As people arrived, other species faltered and vanished, slowly at first and now with such acceleration that Wilson talks of a coming “biological holocaust,” the sixth mass extinction event, the only one caused not by some cataclysm but by a single species—us.

Wilson recently calculated that the only way humanity could stave off a mass extinction crisis, as devastating as the one that killed the dinosaurs 65 million years ago, would be to set aside half the planet as permanently protected areas for the ten million other species. “Half Earth,” in other words, as I began calling it—half for us, half for them. A version of this idea has been in circulation among conservationists for some time.

“It’s been in my mind for years,” Wilson told me, “that people haven’t been thinking big enough—even conservationists. Half Earth is the goal, but it’s how we get there, and whether we can come up with a system of wild landscapes we can hang onto. I see a chain of uninterrupted corridors forming, with twists and turns, some of them opening up to become wide enough to accommodate national biodiversity parks, a new kind of park that won’t let species vanish.”

Forest has been reduced by 97 percent, and there are about three million acres of it left. That’s more catastrophic than what has happened to coral reefs (10 percent to 20 percent destroyed) or the Amazon rainforest (more than 20 percent). The longleaf pine forest’s “Big Cut,” as it’s still known, began after the Civil War and left behind what commentators referred to as “a sea of stumps.” Much of the land has since been reforested, but de-longleafed, and is now planted with row after row of faster-growing pines raised for pulpwood.