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As I geared up for my latest scuba diving adventure in Roatan, Honduras, excitement bubbled within me. The ocean had always been my escape—a vibrant world filled with colorful marine life, intricate coral formations, and a sense of tranquility that’s hard to find on land. This time, however, my anticipation was mixed with a hint of apprehension. I had heard stories about coral bleaching, and I was curious to see firsthand the impact of climate change on these underwater ecosystems.

Descending into the crystal-clear waters, the familiar weightlessness enveloped me. Sunlight filtered down, illuminating the underwater realm in shimmering blues and greens. Fish darted around me, their bright colors a stark contrast to the increasingly pale coral structures that loomed in the distance...

The number of jellyfish spotted in UK waters and on beaches increased by 32% in the past year, according to a survey by the Marine Conservation Society. The most commonly spotted were the huge barrel jellyfish – but rarer warm-water crystal jellyfish were also seen. Jellyfish populations vary naturally over time – but climate change warming the UK seas is creating favourable conditions.

A marine heatwave in June increased UK water temperatures by about 3-4C.

The world has warmed 1.1C compared to the pre-industrial period before humans began burning fossil fuels and a series of broken records this year is alarming scientists.

In August, oceans hit their highest global average temperature on record.

The Marine Conservation Society’s annual wildlife-sightings report is based on...

I am the founder and Director of Earthdive. 37 years ago I founded and organised a charity event called Sport Aid. 19.8 million people took part in 274 cities and 89 countries and delivered a ‘petition of blistered feet’ to the doorstep of the United Nations in New York. They demanded help for victims of the African Famine – and they got it! They raised US$35 million on the day and at a UN Special Session on Africa that followed, US$150m of African debt was cancelled.

It taught me that together, we can help change the world and now I need your help to unite the world again, this time to save our planet.

As a scuba diver I have witnessed the devastating effects climate change has had on our oceans...

The factors affecting coral’s resilience—its ability to adapt to and survive environmental changes—seem to be more nuanced than scientists believed. In a study published Oct. 17 in the journal Global Change Biology, researchers reveal surprising findings about a species common to Caribbean waters. The discovery may help improve efforts to save corals from bleaching and other consequences of climate change.

A team led by Assistant Professor of Biological Sciences Carly Kenkel at the USC Dornsife College of Letters, Arts and Sciences studied the mountainous star coral, Orbicella faveolata, to determine whether coral populations that have survived higher temperatures can pass their heat tolerance on to their offspring.

To the scientists’ surprise, the results showed the opposite: T...

According to a study published in PLOS ONE, 72% of cetacean and pinniped stocks managed under U.S. jurisdiction are highly or very highly vulnerable to climate change. The research was led by Matthew D. Lettrich at NOAA Fisheries, in Silver Spring, Maryland, USA.

Climate change could affect the distribution, behavior, and movements of marine mammals via warming ocean temperatures, rising sea levels, decreasing dissolved oxygen, declining sea ice coverage, ocean acidification, and salinity changes. Climate vulnerability assessments (CVAs) provide a framework for evaluating climate impacts over a broad range of species.

Prior to the study, no known CVAs specifically assessed U.S.-managed marine mammals...

“It’s a really special part of the world,” says marine biologist Taryn Foster from the Abrolhos Islands, 40 miles from the coast of Western Australia. “There are no palm trees or luscious vegetation. But once you get in the water, you see all these tropical species of coral and fish.” Corals are animals called polyps, found mostly in tropical waters. The soft-bodied polyp forms a hard outer shell by extracting calcium carbonate from the sea. Over time those hard shells build up to form the foundations of the reefs we see today. Coral reefs may only cover 0.2% of the seafloor, but they provide a habitat to more than a quarter of marine species.

However, the creatures are sensitive to heat and acidification so in recent years, as the oceans have warmed and become more acidic, corals ha...

More than 200 scientists have signed a letter pushing for “responsible” research into ways to trap planet-heating carbon dioxide in the world’s oceans. They want to take urgent action on the climate crisis, while making sure they don’t trigger any new problems by relying on oceans to help in the fight.

Polluters have trashed the world’s atmosphere with carbon dioxide emissions from fossil fuels. That blanket of pollution is already warming the planet and causing more extreme weather disasters. One way to keep climate change from getting worse is to take some of those historic emissions out of the atmosphere.

Oceans already do that for us, absorbing and holding around 50 times more carbon than the atmosphere. What if humans could supercharge that ability?

That’s what...

Des and Kelvin of Gladstone, Katy and Filimone of Fiji and Victor and Christina of Palau all have the same issue – reefs under their care face unprecedented threats. Reefs that have protected shores and supported local fisheries for thousands of years.  Fisheries sustained through customary management rooted in traditional ecological knowledge accumulated over millennia, reflecting local peoples’ deep understanding of their ecosystems. 

They are not alone – the Pacific is home to 27% of the world’s coral reefs and her island nations are particularly reliant on healthy oceans for food, income and coastal protection, says Dr Manuel Gonzalez-Rivero, Australian Institute of Marine Science.  

New understandings and tools are needed to manage reef-bound islands and coastlines faci...

In addition to the tragic loss of life and property on fire-ravaged Maui, scientists are also concerned about the environmental damage, both on land and under water. Biologists who have spent decades studying marine life in Hawaii fear the aftermath will endanger coral reefs and other marine life.

“The corals are attached to the bottom of the ocean, they cannot move,” said Dr. Jennifer Smith, director of the Marine Biology Research Division at UC San Diego. “So if you were to rain a bunch of sediment, ash, debris on top of them, they could essentially become smothered. Add to that a lot of this ash and debris could have chemical toxins.”

Manuel Mejia with the Coral Reef Alliance in Hawaii said coral reefs require clean, clear, low-nutrient water to grow.

“When you have ashfall ma...

Healthy marine ecosystems and climate stability have always been closely interlinked. One affects the other, and we are seeing this play out on a planetary scale. Climate change is partly the result of the extended mismanagement of oceans, but the inverse is true as well. If we have concrete measures in place to preserve, restore and sustainably manage ocean ecosystems, nature becomes a powerful ally that breathes life into climate mitigation, adaptation and resilience efforts.

Average ocean surface temperatures broke several records in July, with no signs of slowing down...