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The reef surrounding Namotu Island, Fiji, has experienced serious coral bleaching caused by increasing ocean temperatures. Credit: Beau Pilgrim / Climate Visuals

By Kizito Makoye
DAR ES SALAAM, Tanzania, Jul 23 2026 (IPS)

Every morning, as the Indian Ocean retreats from the reef off Zanzibar’s Jambiani village, Chiku Chande steps into the knee-deep lagoon carrying bundles of seaweed seedlings. Years of farming these waters have taught her about every channel and coral outcrop. But lately, the corals that once glowed in brown and gold have become chalky white.

“You don’t need anyone to tell you these changes,” Chande tells IPS. “We see it with our own eyes. The coral has lost its colour.”

Like many families in Jambiani, the 48-year-old grandmother depends on the reef. It shelters her seaweed farm from crashing Indian Ocean waves, supports fish stocks and brings tourists to the village. As the corals bleach and slowly die, she worries about the future.

Chande has watched the reef change year after year. Scientists say her observations mirror what is happening across the world’s tropical oceans.

Scientists long regarded El Niño – the natural warming of parts of the Pacific Ocean that disrupts weather patterns globally – as the main driver of mass coral bleaching

A new study led by Climate Central and published in Oceanography concludes that human-induced climate change has driven every global coral bleaching event over the past four decades. The researchers found greenhouse gas emissions have warmed the oceans so much that El Niño now acts mainly as a trigger rather than the root cause.

“Our study shows that without climate change, coral bleaching would be a rare and isolated event, and global mass coral bleaching simply would not occur,” says Andrew Pershing, Climate Central’s chief programme officer and the study’s lead author.

2026-2027 projected bleaching risk map. A report published in Oceanography argues that nearly every global coral bleaching event over the past 40 years would not have occurred
without human-caused climate change. Credit: Oceanography

Corals bleach when unusually warm water forces them to expel the microscopic algae that provide most of their food and give them their vibrant colours. If temperatures quickly return to normal, corals can recover. But prolonged heat starves them and can kill entire reef ecosystems.

To determine how much of that warming came from human activity, researchers compared today’s sea surface temperatures with computer simulations of a world unaffected by greenhouse gas emissions. They then assessed whether bleaching would still have occurred under those cooler conditions.

Their analysis showed that every global bleaching event since 1998 – including those in 1998, 2010, 2014-2017 and the ongoing event that began in 2023 – required human-caused warming to push ocean temperatures beyond bleaching thresholds. Although El Niño coincided with many of those events, the study found they would not have become global bleaching episodes without decades of warming driven by fossil fuel emissions.

Women seaweed farmers in Zanzibar’s Jambiani village receive guidance while tending seaweed farms in the shallow lagoon, where warming seas have also left nearby coral reefs increasingly bleached. Scientists say human-caused climate change, rather than natural climate cycles, has driven every global mass coral bleaching event on record. Credit: Muhidin Michuzi

The findings have particular implications for Tanzania.

The country’s 1,400-kilometre coastline, which includes the reefs surrounding Zanzibar, Pemba and Mafia islands, supports fisheries, tourism and thousands of coastal livelihoods. Healthy reefs also protect beaches and coastal settlements by absorbing up to 97 percent of incoming wave energy, reducing erosion and storm damage.

As reefs deteriorate, fish populations decline, tourism suffers and coastlines become increasingly vulnerable to flooding and erosion.

Similar pressures are happening across tropical reefs worldwide. Although coral reefs cover less than one percent of the ocean floor, they support roughly a quarter of all marine species and generate an estimated US$2.7 trillion annually in ecosystem services through fisheries, tourism and coastal protection. The Global Coral Reef Monitoring Network estimates the world lost about 14 percent of its coral between 2009 and 2018 as repeated marine heatwaves left reefs too little time to recover.

Recent ocean temperature records suggest the pressure is intensifying.

According to the Copernicus Marine Service, June 2026 was the warmest June on record for global sea surface temperatures, while marine heatwaves covered about 82 percent of the world’s oceans by the end of the month. Because the oceans absorb more than 90 percent of the excess heat trapped by greenhouse gases, marine heatwaves are becoming more frequent and severe, increasing the likelihood of coral bleaching.

The Climate Central researchers project that by 2028 human-caused warming will outweigh El Niño’s influence in every coral reef region worldwide. Bleaching, they say, will increasingly reflect persistently warmer oceans rather than unusually strong natural climate cycles.

Using the same attribution methods, the researchers also assessed bleaching risk during the developing 2026-2027 El Niño. They found that while the climate pattern could still trigger bleaching in some regions, human-caused warming would account for most of the risk, particularly in the southern Caribbean, the Pacific coasts of Central and South America, and parts of East and Southeast Asia.

Globally, the monthly average sea-surface temperature for the extra-polar ocean (60°S–60°N) was the highest for June, exceeding the previous record set in June 2024 by just 0.01ºC. This partly reflected the development of strong El Niño conditions in the equatorial Pacific, according to the Copernicus Climate Change Service. Credit: ECMWF/Copernicus Climate Change Service

The study challenges the long-held assumption that bleaching is mainly a response to natural climate cycles. Researchers say bleaching can no longer be viewed as an occasional event linked to natural climate cycles; scientists say it is increasingly becoming a recurring consequence of steadily warming oceans.

“By isolating the effect of climate change, our study shows that the fate of reefs is closely tied to how much carbon pollution goes into the atmosphere. Protecting reefs from overfishing and pollution is very important. We need as many thriving reef areas as possible. Even during severe events, there are often pockets of coral that persist. These areas can be the source for recovery in the short and long term,” Pershing tells IPS

The Intergovernmental Panel on Climate Change warns that even if global warming is limited to 1.5 degrees Celsius above pre-industrial levels, up to 90 percent of the world’s coral reefs could disappear by mid-century. At 2 degrees Celsius of warming, losses could reach 99 percent.

Chande does not speak in terms of climate attribution. She only knows the reef looks different from when she began farming seaweed. Researchers say the bleaching she has witnessed reflects a much deeper shift: oceans that have steadily warmed over decades because of greenhouse gas emissions.

“When I was younger, the corals were full of colour and fish,” she said. “Now everything looks white. I worry about what is happening to the sea,” she says.

IPS UN Bureau Report

 

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By Ariel F. Dumont
BORGO LAUDATO SI’, Italy, Jul 21 2026 (IPS)

“I’m sorry, Dave. I’m afraid I can’t do that.” By bringing the supercomputer HAL 9000 to life in his 1968 film 2001: A Space Odyssey, American director Stanley Kubrick created one of the most powerful symbols of the fear of artificial intelligence (AI) escaping human control.

Fifty-eight years later, that question is more relevant than ever. It was precisely this issue that brought together more than 200 international figures for three days of discussions in the exceptional setting of Borgo Laudato Si’, located within the papal summer residence at Castel Gandolfo, where Pope Leo XIV is currently staying.

Organised by the Global Nobel Laureates Assembly on Artificial Intelligence and Nuclear War, the conference set out to reflect on “the future of international security, the governance of emerging technologies, disarmament and the building of an economy of peace”.

Yoshiyuki Nagaoka, Executive Director of the Office of External Relations at Soka Gakkai and Executive Director of the Ikeda Center for Peace, Learning, and Dialogue. Credit: Ariel F. Dumont/IPS

The programme brought together a number of leading international figures, including former Italian Prime Minister and former President of the European Commission Romano Prodi; Nobel Peace Prize laureate and Chief Advisor to Bangladesh Muhammad Yunus; Yoshiyuki Nagaoka, President of the Ikeda Center for Peace, Learning, and Dialogue and Executive Director of the Office of External Relations at Soka Gakkai; Filipino journalist and Nobel Peace Prize laureate Maria Ressa; Amnesty International Secretary General Agnès Callamard; and several scientists and nuclear experts.

The assembly was officially opened by Monsignor Fabio Baggio, under-secretary of the Dicastery for Promoting Integral Human Development.

In his welcoming address, he immediately established the central thread of the discussions by stressing that “peace is not simply the absence of war but an order founded on justice, mutual trust, respect for the rule of law and the inviolable dignity of every human being.”

The central idea was clear: regulating artificial intelligence has become imperative if peace – and ultimately humanity’s very survival – is to be preserved. AI is now integrated into military systems, dramatically increasing the risks of proliferation, cyber warfare and high-intensity conflicts, with the potential to undermine global stability and respect for ethical principles.

Although the speakers sometimes differed in their analyses, reflecting their diverse backgrounds, they all converged on one essential conclusion. Artificial intelligence should not be feared, but that certainly does not mean it should be given free rein until it becomes another HAL 9000. On the contrary, most participants stressed the urgent need to establish safeguards before potential abuses become impossible to control.

Karen Hallberg, Argentine physicist and president of the Pugwash Conferences on Science and World Affairs. Credit: Ariel F. Dumont/IPS

This concern was voiced in particular by Karen Hallberg, the Argentine physicist specialising in condensed matter and president of the Pugwash Conferences on Science and World Affairs. AI, she argued, is a “dual-use” technology, much like nuclear energy itself. While nuclear fission has led to extraordinary advances in energy production and medicine, it has also made atomic weapons possible.

“Artificial intelligence has the same ambivalence. It can certainly contribute to scientific research, medicine and even the monitoring of international commitments. However, its integration into nuclear weapons systems could usher in a period of dangerous uncertainty,” she warned.

Hallberg also stressed that one of the greatest risks would be to allow algorithms to intervene in processes related to the command and control of nuclear weapons – for instance, analysing satellite imagery, interpreting military situations or contributing to decisions whose consequences could prove irreversible for the future of humanity.

“I am not afraid; I am concerned. And it is precisely this concern that should give us the determination to act before it is too late,” she said, calling on governments to apply the precautionary principle before technology outpaces political regulation and leads to an irreversible drift.

A concern that Nagaoka shares, albeit from a different perspective, is that artificial intelligence is not inherently dangerous. Everything, he argued, depends on how humanity chooses to use it.

“The question ultimately comes back to humanity itself, which has the choice of becoming either more selfish or more compassionate.”

Nagaoka placed particular emphasis on the responsibility of younger generations, who are growing up in an environment where digital tools occupy an ever greater place and where the risk of isolation continues to increase. Humanity’s greatest challenge, therefore, is not to reject AI but to learn how to use it without abandoning the uniquely human capacity for judgement.

“We must preserve our conscience and our wisdom when making decisions,” he said, reminding participants that education and critical thinking will remain the best safeguards against a technology capable of influencing both individual and collective choices.

“I recently heard on television the story of an 86-year-old Japanese woman faced with the painful decision of ending life support for her seriously ill husband. She chose to seek advice from ChatGPT rather than from her family.”

For Nagaoka, the issue is not to condemn such a choice but rather to reflect on these new forms of dialogue emerging in societies where machines may increasingly become trusted interlocutors at the most important moments of human existence.

This reflection on human responsibility echoed the concerns raised by Maria Ressa, winner of the 2021 Nobel Peace Prize for her defence of freedom of expression and her fight against disinformation.

Peace is not simply the absence of war but an order founded on justice, mutual trust, respect for the rule of law and the inviolable dignity of every human being.
Throughout the discussions, she repeatedly highlighted the risks AI poses to the future of democracy, including the accelerating spread of false information, the large-scale manipulation of public opinion and the concentration of power in the hands of a limited number of technology companies.

“AI is not simply an issue of innovation. It concerns the very functioning of democratic societies,” Ressa insisted.

But it was undoubtedly Yunus who delivered the conference’s most far-reaching criticism by shifting the debate onto economic ground. The Bangladeshi economist, founder of the Grameen Bank and recipient of the 2006 Nobel Peace Prize offered a profoundly humanist critique that challenged the very foundations of AI’s use within contemporary capitalism.

“The main problem is not simply the possible disappearance of certain jobs, but the growing concentration of wealth,” Yunus said.

Artificial intelligence, he warned, risks reinforcing a model in which a handful of companies control technologies, data and income, while an ever larger share of the population is excluded from economic participation.

“It could deprive people of their livelihoods, their dignity and their ability to remain independent,” he argued.

The future, he said, cannot be an economy in which artificial intelligence replaces human beings. Instead, it must be based on participation, entrepreneurship and the sharing of opportunities.

His message to political leaders around the world was unequivocal: AI must not become an instrument for concentrating power but rather a tool placed at the service of everyone.

And now what? At the end of these discussions, one certainty emerges: there can be no turning back. Artificial intelligence is now part of our world. Humanity should not fear it, nor should it regard it as tomorrow’s greatest enemy. But several fundamental questions remain unanswered: Who will control this technology, according to what rules, and in the service of what kind of society?

More than half a century after HAL 9000, the real threat may not be that a machine could become human. It may be that human beings gradually renounce what defines them most: their capacity to decide, to judge and to assume responsibility for their own choices.

IPS UN Bureau Report

Note: This article is brought to you by IPS Noram in collaboration with INPS Japan and Soka Gakkai International in consultative status with ECOSOC.

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