Skip to main content

Sign up for our newsletter.

Quality journalism. Progressive values. Direct to your inbox.

Bleached coral off the coast of Islamorada, Florida. (Photo: Kelsey Roberts, USGS/Wikimedia Commons/cc)

Unprecedented Bleaching Event Portends Mass Death of World's Coral Ecosystems

'It's time to shift this conversation to what we can do to conserve these amazing organisms in the face of this unprecedented global bleaching event'

Nika Knight Beauchamp

The world's oceans are enduring the longest-lasting and most widespread coral bleaching event ever recorded, according to the National Oceanographic and Atmospheric Administration (NOAA).

And the massive bleaching event is predicted to get even worse—extending into a third, unprecedented year.

The current bleaching event has already all but destroyed Australia's Great Barrier Reef, and NOAA's experts say that warm ocean temperatures will soon trigger bleaching in the northern hemisphere, "including around Hawaii, Micronesia, the Florida Keys and Puerto Rico," the Guardian reports.

Bleaching occurs when overly warm ocean waters cause coral to expel the algae living inside of it, which turns the coral white and erodes its structures, as Common Dreams has reported.

NOAA's Coral Reef Watch has described the growing swaths of bleached and dying coral as "ghostly underwater graveyards."

A map shows the regions in the Northern Hemisphere where coral reef stress is predicted. (Image: NOAA)

"It's time to shift this conversation to what we can and are doing to conserve these amazing organisms in the face of this unprecedented global bleaching event," said the director of NOAA's coral reef conservation program, Jennifer Koss, to the Guardian.

"Coral in every major reef region has already experienced severe bleaching," the newspaper adds.

"Climate change has caused global sea surface temperatures to rise by about 1C over the past century, pushing corals closer to their bleaching threshold. A strong El Niño, as well as other weather phenomena, raised the temperature further this year," the Guardian notes.

Extended bleaching events eventually kill a reef—as has already been happening to large stretches of the Great Barrier Reef.

And as with many effects of climate change, the poorest and smallest nations will likely suffer the most from the catastrophic bleaching event. Mark Eakin, director of NOAA's Coral Reef Watch, told the Guardian, "The biggest bleaching threat over the next six months is to the reefs in two U.S. freely associated states: Palau and the Federated States of Micronesia. Islanders there are very dependent on their coral reefs and diving tourism is a major contributor to their economies."

"This event may have major ecological and economic impacts on those islands," Eakin said.

Dead coral reefs "are perhaps the starkest reminders—like the melting Arctic—that a thickening blanket of greenhouse gases is irrevocably changing the face of the Earth," as Inside Climate News recently wrote.


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.

'Enough is Enough': Hundreds of Thousands March Across the UK

'As wages fall while profits soar, our message is clear... We are here to win.'

Common Dreams staff ·


California Gov. Newsom Proposes Windfall Profits Tax on Big Oil

Calls for windfall profits taxes have increased globally in recent weeks

Common Dreams staff ·


'Incredible': Omar and Khanna Staffers Join Levin's Office in Unionizing

"It is long past time the United States Congress became a unionized workplace, and that includes my own staff," said Rep. Ilhan Omar. "I am proud of all the people on my team who have played a leading role in the staff unionization effort. Solidarity forever."

Jessica Corbett ·


Destructive Hurricanes Fuel Calls for Biden to Declare Climate Emergency

"Mother Nature is not waiting for the president or Congress to declare a climate emergency. She's showing us in real-time here in the United States—with wildfires, floods, heatwaves, hurricanes, and drought."

Jessica Corbett ·


Spain Approves 'Solidarity' Tax to Make Nation's Top 0.1% Pay a Fairer Share

The country's finance minister said that looming changes are bound to make the tax code "more progressive, efficient, fair, and also enough to guarantee social justice and economic efficiency."

Kenny Stancil ·

Common Dreams Logo