Skip to main content

Sign up for our newsletter.

Quality journalism. Progressive values. Direct to your inbox.

red panda

The red panda is one of the species that researchers say, based on a new analysis, should be targeted with increased conservation efforts. (Photo: Mathias Appel/Red Panda Network/Flickr)

Humanity Chopping Down Tree of Life, Warns New Research, 'Including Branch We Are Sitting On'

"We're entering what could be an extinction on the scale of what killed the dinosaurs."

Jessica Corbett

Underscoring the urgent need for increased and intensely focused conservation efforts, new research shows that human activity worldwide is wiping out plant and animal life—including our own—so rapidly that evolution can't keep up.

"We are starting to cut down the whole tree [of life], including the branch we are sitting on right now."
—Matt Davis, lead researcher

Paleontologist and lead researcher Matt Davis of Denmark's Aarhus University warned, "We are starting to cut down the whole tree [of life], including the branch we are sitting on right now."

"We are doing something that will last millions of years beyond us," Davis told the Guardian. "It shows the severity of what we are in right now. We're entering what could be an extinction on the scale of what killed the dinosaurs."

The analysis, published Monday in the Proceedings of the National Academy of Sciences, specifically focused on mammals that currently exist as well as those which went extinct as humans spread across the globe, but it provides insight on the broader biodiversity crisis. It adds to a growing body of recent research that has warned of imminent mass extinction driven by unsustainable human activity, the climate crisis, and inadequate conservation efforts.

Even under the best circumstances, with dramatic improvements to current conservation work, the new analysis posited it will take 3-5 million years "just to diversify enough to regenerate the branches of the evolutionary tree that they are expected to lose over the next 50 years. In addition, the study found it could take 5-7 million years "to restore biodiversity to its level before modern humans evolved," according to a statement outlining the findings.

The degree of biodiversity loss over the next five decades will be significantly influenced by the changes to current human behaviors, or lack thereof—but the impact of losing species can vary greatly.

"Large mammals, or megafauna, such as giant sloths and saber-toothed tigers, which became extinct about 10,000 years ago, were highly evolutionarily distinct. Since they had few close relatives, their extinctions meant that entire branches of Earth's evolutionary tree were chopped off," Davis explained. Today, meanwhile, "there are hundreds of species of shrew, so they can weather a few extinctions."

While Davis said that "we have no reason to assume we will ever be able to bring extinction rates back down to normal background levels," he pointed out that the new research "highlights species we should try to save and could help us prioritize conservation."

"We once lived in a world of giants: giant beavers, giant armadillos, giant deer, etc., we now live in a world that is becoming increasingly impoverished of large wild mammalian species. The few remaining giants, such as rhinos and elephants, are in danger of being wiped out very rapidly," noted Jens-Christian Svenning from Aarhus University.

The team determined that species which could benefit from extra conservation efforts now—before it's too late to save them—include the black rhino, the red panda, and the indri. As Davis concluded, "It is much easier to save biodiversity now than to re-evolve it later." 


Our work is licensed under Creative Commons (CC BY-NC-ND 3.0). Feel free to republish and share widely.

This is the world we live in. This is the world we cover.

Because of people like you, another world is possible. There are many battles to be won, but we will battle them together—all of us. Common Dreams is not your normal news site. We don't survive on clicks. We don't want advertising dollars. We want the world to be a better place. But we can't do it alone. It doesn't work that way. We need you. If you can help today—because every gift of every size matters—please do. Without Your Support We Simply Don't Exist.

Architect of Texas Abortion Ban Takes Aim at LGBTQ+ Rights While Urging Reversal of Roe

"Make no mistake, the goal is to force extreme, outdated, religious-driven values on all of us through the courts."

Jessica Corbett ·


Ahead of Canadian Election, Bernie Sanders and Rashida Tlaib Endorse NDP

"Bernie, you have fought courageously for public healthcare, affordable medication, making the rich pay their fair share, and tackling the climate crisis," said party leader Jagmeet Singh. "We're doing the same here."

Jessica Corbett ·


US Urged to End Drone Strikes After Pentagon Says Killing 10 Afghan Civilians Was 'Horrible Mistake'

"That was not a 'mistake,'" said journalist Anand Giridharadas. "War crimes are not oopsies."

Brett Wilkins ·


40+ NYC Activists Arrested for Protests Against Banks Fueling Climate Emergency

"We're sending a message loud and clear that the little action that politicians and greenwashing CEOs have taken so far does not begin to deal with the magnitude of this crisis."

Jessica Corbett ·


FDA Panel Recommends Pfizer Booster Shots for People 65+ and Especially Vulnerable

The scientific advisory committee voted down a recommendation for other adults.

Common Dreams staff ·

Support our work.

We are independent, non-profit, advertising-free and 100% reader supported.

Subscribe to our newsletter.

Quality journalism. Progressive values.
Direct to your inbox.

Subscribe to our Newsletter.


Common Dreams, Inc. Founded 1997. Registered 501(c3) Non-Profit | Privacy Policy
Common Dreams Logo