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A green sea turtle among the corals at Lady Elliot Island, the southernmost coral cay of Australia's Great Barrier Reef. Photo: Jonas Gratzer/LightRocket via Getty Images

Australia's Great Barrier Reef has lost over half of its coral populations in the past three decades because of ocean warming, a study published in the journal Proceedings of the Royal Society B published Wednesday finds.

Why it matters: The World Heritage-listed underwater ecosystem is a haven for biodiversity, with some 4,000 species of fish, 700 species of coral and "thousands of other species of plants and animals," per the nonprofit Coral Reef Alliance. It spans some 1,400 miles — making it the largest coral reef ecosystem in the world.

What they did: Researchers from the ARC Centre of Excellence for Coral Reef Studies (CoralCoE), in Queensland, Australia, assessed coral communities and their colony size along the length of the Great Barrier Reef from 1995 to 2017.

What they found: Researchers discovered that climate change is driving an increase in the frequency of reef disturbances, such as marine heatwaves. Nearly every coral species has declined since the comprehensive research began.

  • "We found the number of small, medium and large corals on the Great Barrier Reef has declined by more than 50% since the 1990s," said study co-author Professor Terry Hughes, from CoralCoE, in a statement.
  • Researchers uncovered steeper deteriorations of coral colonies in the northern and central Great Barrier Reef after mass coral bleaching events in 2016 and 2017. The southern part of the reef was also exposed to record temperatures earlier this year.
"The decline occurred in both shallow and deeper water, and across virtually all species — but especially in branching and table-shaped corals. These were the worst affected by record breaking temperatures that triggered mass bleaching in 2016 and 2017."
— Hughes

What they're saying: Bob Richmond, director of the Kewalo Marine Laboratory at the University of Hawai'i at Manoa, who's extensively researched reefs, told the Washington Post the Australian research shows "demographic changes are occurring on a regional scale ... on reef slopes that make it difficult for coral reefs to persist over time."

  • "These bleaching events are just hammering these reefs. ... The problem is it's an accelerated loss. It's hard to have a crystal ball and say a date," Richmond said.
  • "Scientists are always trying to be careful, but if we don't act meaningfully in the next five years, we will not have vital and vibrant coral reefs as a legacy for future generations."

The bottom line: "The loss of these corals means a loss of habitat, which in turn diminishes fish abundance and the productivity of coral reef fisheries," the study notes.

  • "[W]e must sharply decrease greenhouse gas emissions ASAP," the researchers concluded.

Go deeper: Global warming is pushing the Great Barrier Reef to the brink

Go deeper

2 hours ago - Health

Biden gets COVID-19 booster shot on live television

President Biden received a Pfizer-BioNTech coronavirus vaccine booster shot on live television on Monday, while also urging Americans to get vaccinated.

Driving the news: The Centers for Disease Control and Prevention last week recommended Pfizer booster shots for millions of people, including those 65 years and older and individuals at high-risk of severe COVID-19.

John Hinckley, who shot Reagan, wins unconditional release

John Hinckley Jr. sitting on the back seat of a car in 1981. Photo: Bettmann/Getty Images

A federal judge on Monday approved the unconditional release of John Hinckley Jr., who tried to assassinate former President Reagan in 1981.

State of play: U.S. District Court Judge Paul L. Friedman in Washington ruled that Hinckley can be freed from all court supervision in 2022 if he remains mentally stable and continues to follow rules that were imposed on him after he was released from a Washington mental health facility in 2016 to live in Virginia, AP reports.

Rep. Karen Bass launches run for Los Angeles mayor

Photo: Tom Williams/CQ-Roll Call, Inc via Getty Images

Rep. Karen Bass (D-Calif.) on Monday launched her bid for mayor of Los Angeles.

Why it matters: Bass is a high-profile member of Congress. The former chair of the Congressional Black Caucus, she was considered as a potential running mate to President Joe Biden and was a lead negotiator in the recently-ended talks on police reform. Should Bass win the mayoral election, she would become the first female mayor in L.A. history.

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