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Oceans face ‘triple threat’ of extreme heat, oxygen loss and acidification

June 9, 2024

Oceans face ‘triple threat’ of extreme heat, oxygen loss and acidification

Third of world’s ocean surface particularly vulnerable to threats driven by burning fossil fuel and deforestation, new research finds

The world’s oceans are facing a “triple threat” of extreme heating, a loss of oxygen and acidification, with extreme conditions becoming far more intense in recent decades and placing enormous stress upon the planet’s panoply of marine life, new research has found.

About a fifth of the world’s ocean surface is particularly vulnerable to the three threats hitting at once, spurred by human activity such as the burning of fossil fuels and deforestation, the study found. In the top 300 meters of affected ocean, these compound events now last three times longer and are six times more intense than they were in the early 1960s, the research states.

Dr Alex Hearn and his colleagues in a boat in fading light tagging a shark in the Galápagos marine reserve.
‘Where do sharks hang out?’: the race to find safe spaces for the Galápagos’ ocean-going predators
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The study’s lead author warned that the world’s oceans were already being pushed into an extreme new state because of the climate crisis. “The impacts of this have already been seen and felt,” said Joel Wong, a researcher at ETH Zurich, who cited the well-known example of the heat “blob” that has caused the die-off of marine life in the Pacific Ocean. “Intense extreme events like these are likely to happen again in the future and will disrupt marine ecosystems and fisheries around the world,” he added.

The research, published in AGU Advances, analyzed occurrences of extreme heat, deoxygenation and acidification and found that such extreme events can last for as long as 30 days, with the tropics and the north Pacific particularly affected by the compounding threats.

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Can geoengineering fix the climate? Hundreds of scientists say not so fast

December 29, 2022

Can geoengineering fix the climate? Hundreds of scientists say not so fast

The Biden administration is developing a controversial solar geoengineering research plan to the dismay of many experts

Proposed geoengineering methods include pumping salt water into clouds to make them more reflective of sunlight, or to place ice particles in clouds to stop them from trapping heat.
Proposed geoengineering methods include pumping salt water into clouds to make them more reflective of sunlight, or to place ice particles in clouds to stop them from trapping heat. Photograph: Charlotte Observer/MCT/Getty Images

As global heating escalates, the US government has set out a plan to further study the controversial and seemingly sci-fi notion of deflecting the sun’s rays before they hit Earth. But a growing group of scientists denounces any steps towards what is known as solar geoengineering.

The White House has set into motion a five-year outline for research into “climate interventions”. Those include methods such as sending a phalanx of planes to spray reflective particles into the upper reaches of the atmosphere, in order to block incoming sunlight from adding to rising temperatures.

Graphic showing a polar ice cap melting through an hourglass onto a city beneath.
Carbon bombs and Gulf Stream collapse: the most urgent climate stories of our time
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The work is required by Congress. It is “not new research, but a report that highlights some of the key knowledge gaps and recommendations of priority topics for relevant research”, said a spokesperson for the White House’s office of science and technology policy, adding Joe Biden’s administration wants “effective and responsible CO2 removal” as well as deep cuts to greenhouse gas emissions.

Several American researchers, somewhat reluctantly, want to explore options to tinker with the climate system to help restrain runaway global heating, even as they acknowledge many of the knock-on risks aren’t fully known. “Until recently, I thought it was too risky, but slow progress on cutting emissions has increased motivation to understand techniques at the margins like solar geoengineering,” said Chris Field, who chaired a National Academies of Sciences report last year that recommended at least $100m being spent researching the issue.

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Hottest ocean temperatures in history recorded last year

January 16, 2022

Hottest ocean temperatures in history recorded last year

Ocean heating driven by human-caused climate crisis, scientists say, in sixth consecutive year record has been broken

An oil platform stands offshore as cargo shipping container ships wait in the Pacific Ocean to enter the port of Los Angeles.
An oil platform stands offshore as cargo shipping container ships wait in the Pacific Ocean to enter the port of Los Angeles. Photograph: Patrick T Fallon/AFP/Getty Images

The world’s oceans have been set to simmer, and the heat is being cranked up. Last year saw the hottest ocean temperatures in recorded history, the sixth consecutive year that this record has been broken, according to new research.

The heating up of our oceans is being primarily driven by the human-caused climate crisis, scientists say, and represents a starkly simple indicator of global heating. While the atmosphere’s temperature is also trending sharply upwards, individual years are less likely to be record-breakers compared with the warming of the oceans.

A firefighter sprays water as a house burns in the Dixie fire in the Indian Falls area of Plumas County, California.
Climate crisis: last seven years the hottest on record, 2021 data shows
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Last year saw a heat record for the top 2,000 meters of all oceans around the world, despite an ongoing La Niña event, a periodic climatic feature that cools waters in the Pacific. The 2021 record tops a stretch of modern record-keeping that goes back to 1955. The second hottest year for oceans was 2020, while the third hottest was 2019.

“The ocean heat content is relentlessly increasing, globally, and this is a primary indicator of human-induced climate change,” said Kevin Trenberth, a climate scientist at the National Center for Atmospheric Research in Colorado and co-author of the research, published in Advances in Atmospheric Sciences.

Warmer ocean waters are helping supercharge storms, hurricanes and extreme rainfall, the paper states, which is escalating the risks of severe flooding. Heated ocean water expands and eats away at the vast Greenland and Antarctic ice sheets, which are collectively shedding around 1tn tons of ice a year, with both of these processes fueling sea level rise.

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EPA head Scott Pruitt says global warming may help ‘humans flourish’

February 8, 2018

EPA head Scott Pruitt says global warming may help ‘humans flourish’

EPA administrator says ‘There are assumptions made that because the climate is warming that necessarily is a bad thing’

‘It’s fairly arrogant for us to think we know exactly what [the ideal surface temperature] should be in 2100,’ Pruitt has said.
Scott Pruitt: ‘It’s fairly arrogant for us to think we know exactly what [the ideal surface temperature] should be in 2100.’ Photograph: Michael Reynolds/EPA

Scott Pruitt, the head of the Environmental Protection Agency, has suggested that global warming may be beneficial to humans, in his latest departure from mainstream climate science.

Pruitt, who has previously erred by denying that carbon dioxide is a key driver of climate change, has again caused consternation among scientists by suggesting that warming temperatures could benefit civilization.

The EPA administrator said that humans are contributing to climate “to a certain degree”, but added: “We know humans have most flourished during times of warming trends. There are assumptions made that because the climate is warming that necessarily is a bad thing.

“Do we know what the ideal surface temperature should be in the year 2100 or year 2018?” he told a TV station in Nevada. “It’s fairly arrogant for us to think we know exactly what it should be in 2100.”

Pruitt said he wanted an “honest, transparent debate about what we do know and what we don’t know, so the American people can be informed and make decisions on their own”.

Under Pruitt’s leadership, the EPA is mulling whether to stage a televised “red team blue team” debate between climate scientists and those who deny the established science that human activity is warming the planet.

Donald Trump has also repeatedly questioned the science of climate change, tweeting during a cold snap in December that the US “could use a little bit of that good old Global Warming that our Country, but not other countries, was going to pay TRILLIONS OF DOLLARS to protect against”.

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Olduvai IV: Courage
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Olduvai II: Exodus
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