Skip to main content

Sign up for our newsletter.

Quality journalism. Progressive values. Direct to your inbox.

A turtle swims among the coral of the Great Barrier Reef

A green sea turtle swims among the corals of the Great Barrier Reef in Queensland, Australia on October 10, 2019. (Photo: Jonas Gratzer/LightRocket via Getty Images)

Fueled by Climate Crisis, Planet Lost 14% of Coral Reefs in Just One Decade

"We are running out of time: we can reverse losses, but we have to act now."

Jake Johnson

The most comprehensive study of the health of the world's coral reefs to date shows that warming temperatures driven by the human-caused climate crisis wiped out a staggering 14% of the diverse underwater ecosystems between 2009 and 2018—a trend that's likely to continue without urgent action.

"We must not leave future generations to inherit a world without coral."

Conducted by the Global Coral Reef Monitoring Network (GCRMN) and released Tuesday, the detailed report stresses that "the greatest threat" to coral reefs is "warming waters brought about by human activities." From 2009 to 2018, the report notes, "the increasing frequency and geographic extent of mass coral bleaching events"—many which are driven by rising ocean temperatures—"have prevented coral cover from recovering."

The study, which draws on data collected by more than 300 scientists at 12,000 sites around the world, also pointed to "other local pressures such as overfishing, unsustainable coastal development, and declining water quality" as factors contributing to the loss of coral reefs in recent years.

While coral reefs cover just 1% of the ocean floor, they support an estimated 25% of all marine life. "An irrevocable loss of coral reefs," the report warns, "would be catastrophic."

Inger Andersen, executive director of the United Nations Environment Program—which provided financial and technical for the new study— said in a statement that the findings show "we are running out of time: we can reverse losses, but we have to act now."

"Coral reefs are the canary in the coal mine telling us how quickly it can go wrong."

"At the upcoming climate conference in Glasgow and biodiversity conference in Kunming, decisionmakers have an opportunity to show leadership and save our reefs, but only if they are willing to take bold steps," said Andersen. "We must not leave future generations to inherit a world without coral.”

Published just over two months after the 21-nation World Heritage Committee voted down an effort to formally categorize the Great Barrier Reef as endangered, the report observes that sharp declines in coral cover over the past decade have "almost invariably" corresponded with "rapid increases in sea surface temperatures, indicating their vulnerability to spikes, which is a phenomenon that is likely to happen more frequently as the planet continues to warm."

"Since 2009, the overwhelming trend in global average hard coral cover has been downward," the study finds. "Between 2009 and 2018, global average hard coral cover declined from 33.3% to 28.8%... To put this into context, this equates to about 11,700 km² of coral, which is approximately the equivalent of losing all the hard coral currently living on Australia's coral reefs."

David Obura, chair of the coral specialist group at the International Union for Conservation of Nature and one of the editors of the new report, told the New York Times that "coral reefs are the canary in the coal mine telling us how quickly it can go wrong."

Pointing to the 14% loss of coral reefs globally, Obura noted that "in finance, we worry about half-percent declines and half-percent changes in employment and interest rates."


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

We've had enough. The 1% own and operate the corporate media. They are doing everything they can to defend the status quo, squash dissent and protect the wealthy and the powerful. The Common Dreams media model is different. We cover the news that matters to the 99%. Our mission? To inform. To inspire. To ignite change for the common good. How? Nonprofit. Independent. Reader-supported. Free to read. Free to republish. Free to share. With no advertising. No paywalls. No selling of your data. Thousands of small donations fund our newsroom and allow us to continue publishing. Can you chip in? We can't do it without you. Thank you.

Supreme Court Denies Trump Bid to Conceal Records From Jan. 6 Panel

One government watchdog group welcomed the decision as "a huge win for transparency."

Jessica Corbett ·


Jayapal, Lee Resolution Promotes More Peaceful US Foreign Policy

"It's far past time we take our foreign policy into the 21st century," said Rep. Barbara Lee. "We should be leading with diplomacy and human needs as the path to global security."

Brett Wilkins ·


Anti-War Veterans Group Issues Its Own 'Nuclear Posture Review'

Released ahead of a Biden administration report, the assessment warns that the danger of nuclear war is greater than ever.

Jessica Corbett ·


Critics Warn Puerto Rico Debt Plan Will Lead to More Austerity

"The island's ability to resume growth and avoid cuts in anti-poverty programs are both chief concerns," said one economic justice advocate.

Julia Conley ·


Faith Leaders, Rights Groups to Biden: End Immigration Detention

"People are losing their lives to a detention system that simply does not need to exist," said one immigrant rights advocate.

Kenny Stancil ·

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