Extinction rates have slowed as conservation efforts gain real traction

The narrative around extinction has been grim for so long that good news feels almost suspicious. But new research from the University of Arizona challenges the assumption that species are disappearing faster than ever—and suggests that decades of conservation work may actually be paying off.

Kristen Saban and John Wiens analyzed data from nearly two million species, tracking 912 extinctions across the past five centuries. Their finding: extinction rates peaked roughly a century ago and have since declined for plants, arthropods, and land vertebrates. "Extinction rates are not getting faster towards the present, as many people claim, but instead peaked many decades ago," Wiens said in the study, published in Proceedings of the Royal Society B: Biological Sciences.

This contradicts the doomsday framing that's become standard in conservation discourse. But here's the crucial part—it's not because the problem has gone away. It's because the problem has changed.

The Threat Landscape Has Shifted

Historically, most extinctions happened on islands like Hawaii, where invasive species wreaked havoc on species with nowhere to escape. Freshwater ecosystems on continents also saw heavy losses, driven mainly by habitat destruction. The researchers found no evidence that climate change has yet driven higher extinction rates in the past 200 years—though Wiens was careful to note this doesn't mean climate change isn't urgent. It means the extinctions we've already counted don't reflect the threats species face right now.

Today's most threatened species are mainland animals facing habitat loss and, increasingly, climate impacts. The IUCN's data on 163,000 species paints a different picture than historical extinction patterns. Understanding this shift matters because it tells conservationists where to focus resources—not on repeating what worked in 1950, but on addressing what's actually happening today.

Conservation Is Working

Why the slowdown? Partly because people have spent the last century learning how to keep species from disappearing. Habitat protection, captive breeding programs, legal protections—these aren't glamorous, but they work. "We have evidence from other studies that investing money in conservation actually works," Wiens noted. This isn't speculation. It's measurable.

But Saban, now a doctoral student at Harvard, was clear that this isn't permission to relax. "Biodiversity loss is a huge problem right now," she said. "It's important that we talk about it with accuracy—that our science is rigorous in how we're able to detail these losses and prevent future ones."

The real insight here is that data-driven hope isn't the same as false comfort. When you stop treating extinction as an unstoppable asteroid and start seeing it as a problem with knowable causes and proven solutions, the work becomes possible. Not easy. Possible.

The next phase of conservation will look different from the last one, because the threats have changed. What matters is that we're paying attention to what's actually happening—and adjusting accordingly.