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Study Shows How Solar Eclipse Made Some Birds Sing Like a New Day Dawned

A bird sits on a branch in front of a partial solar eclipse near Bridgwater, in southwestern England, March 20, 2015. REUTERS/Toby Melville/File Photo
A bird sits on a branch in front of a partial solar eclipse near Bridgwater, in southwestern England, March 20, 2015. REUTERS/Toby Melville/File Photo
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Study Shows How Solar Eclipse Made Some Birds Sing Like a New Day Dawned

A bird sits on a branch in front of a partial solar eclipse near Bridgwater, in southwestern England, March 20, 2015. REUTERS/Toby Melville/File Photo
A bird sits on a branch in front of a partial solar eclipse near Bridgwater, in southwestern England, March 20, 2015. REUTERS/Toby Melville/File Photo

On April 8, 2024, a total solar eclipse traversed a wide swathe of North America stretching 2,500 miles (4,000 km) from Mexico's Pacific Coast through Texas and across 14 other US states into Canada. The period of totality, when the moon covered the face of the sun, lasted about four minutes depending on the location.

While throngs of people gazed skyward to see the celestial show, scientists were studying the effects of the eclipse on birds, whose daily and seasonal rhythms are strongly guided by sunlight. They documented changes in vocal behavior in most - not all - species studied, with birds that naturally make a burst of songs and calls around daybreak the most affected, Reuters reported.

When the sunlight began to return after totality, some species produced their customary "dawn chorus," as if greeting a new day. Some species fell silent, while others did not change their behavior compared to a normal day.

"Light is one of the most powerful forces shaping bird behavior, and even a four-minute 'night' was enough for many species to act as if it were morning again. That tells us just how sensitive some birds are to changes in light," said Liz Aguilar, a doctoral student in evolution, ecology and behavior at Indiana University and lead author of the study published this week in the journal Science.

"Based on previous research, most of which was collected in the lab, we know that changes in light are the most important cues used by living organisms to time their daily rhythms. As day transitions to night and vice versa, hormone levels and gene expression in the body change, and that causes differences in behavior," said study co-author Dustin Reichard, a biology professor at Ohio Wesleyan University.

While there had been anecdotal evidence concerning the behavior of birds during an eclipse and some research involving certain species, this study offered the most comprehensive look yet at the subject, with the findings coming from two datasets.

Fourteen recording units placed around Bloomington, Indiana, captured more than 100,000 bird vocalizations that were analyzed using machine-learning tools to discern the individual species making the songs and calls. In addition, nearly 1,700 people across North America submitted more than 11,000 observations of bird behavior around the eclipse through an app created by the researchers called SolarBird that let anyone in the general public with a smartphone contribute data.

A total of 52 species were documented around Bloomington, 29 of which exhibited significant changes in their vocal behavior as the eclipse occurred compared to a normal April afternoon.

"Different bird species greet the dawn in very different ways. Some have loud, elaborate dawn choruses, while others are much quieter. We found that species known for the most intense dawn choruses were also the ones most likely to react to the eclipse," Aguilar said.

Various species behaved in various ways. For instance, American robins, known for singing very early in the morning while it is still dark, had one of the largest increases in vocalizations during and just after totality - six times higher than a non-eclipse afternoon.

Barred owls vocalized four times as much as a non-eclipse afternoon just after totality ended, when light levels resembled the dawn or dusk periods when their activity normally increases.

Carolina wrens, also known for being particularly vocal including around dawn, were not affected at all by the eclipse.

"It actually makes sense that not all species reacted the same way. Birds differ in how sensitive they are to changes in light. It would have been more surprising if every species responded identically. Each species has its own activity patterns, energetic needs and sensory abilities, so they interpret environmental changes differently," Aguilar said.

"We looked for patterns among closely related species and also compared migratory versus resident birds, but we didn't find any consistent differences," Aguilar said. "That tells us there's still more to learn about what makes certain species more or less sensitive to sudden changes in light, which will be an important direction for future research."

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Fossil Fuel Emissions Fall Due to Iran War, Renewables, Research Finds

Vessels at the Strait of Hormuz, as seen from Musandam, Oman, November 9, 2026. (Reuters)
Vessels at the Strait of Hormuz, as seen from Musandam, Oman, November 9, 2026. (Reuters)
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Fossil Fuel Emissions Fall Due to Iran War, Renewables, Research Finds

Vessels at the Strait of Hormuz, as seen from Musandam, Oman, November 9, 2026. (Reuters)
Vessels at the Strait of Hormuz, as seen from Musandam, Oman, November 9, 2026. (Reuters)

Global fossil fuel emissions are projected to fall slightly in 2026 due to the expansion of renewable energy and the oil price shock sparked by the Iran war, researchers said Tuesday.

Emissions from the burning of oil, gas and coal -- the main drivers of climate change -- rose by 0.9 percent per year on average in the past decade, hitting a record high in 2025, according to the Global Carbon Budget report.

But they are expected to drop by 0.4 percent in 2026, according to the research, published as nations meet at the UN's COP31 climate summit in Antalya, Türkiye.

It would be the first annual drop since 2020, when the Covid pandemic paralyzed the global economy, trade and transport.

This year, the US-led war in Iran and closure of the Strait of Hormuz played a role in driving emissions down as it caused a drop in oil consumption amid soaring crude prices, the researchers found.

The deployment of solar panels, wind farms and electric vehicles also contributed to the drop. Two thirds of the increase in global energy demand is being met by solar and wind power and electric vehicles, the report found.

"A decline in fossil CO2 emissions is encouraging, but a reduction driven partly by geopolitical shocks is not a sustainable climate solution," said Pierre Friedlingstein, director of the Global Carbon Budget Office at the University of Exeter in Britain.

"The long-term answer remains the rapid deployment of clean energy technologies," said Friedlingstein, who led the study published in the journal Earth System Science Data.

- Rebound looms -

Corinne Le Quere, a climate change science professor at the University of East Anglia, noted that emissions rebounded when economies recovered following shocks such as Covid or the global financial crisis.

A rebound is likely "when the oil tensions go away", she said in a media briefing.

Oil-related emissions are projected to drop 1.9 percent last year but it was "likely a short-term response to the energy shock triggered by the Iran conflict", the researchers said.

Gas emissions are set to fall 0.3 percent while those from coal use will rise 0.6 percent.

Overall, fossil carbon dioxide emissions are expected to reach 38.2 billion tons in 2026.

Including emissions from land-use change such as deforestation, total CO2 emissions are projected to rise to 43.3 billion tons, from 42.8 billion tonnes last year.

The researchers said land-use emissions are projected to rise partly due to peat fires and forest degradation in southeast Asia, associated with drier conditions linked to this year's exceptionally strong El Nino climate pattern.

The report found that the world's carbon budget -- the amount of CO2 that can be emitted before global warming exceeds 1.5C above pre-industrial levels -- stands at 150 billion tons.

The researchers calculated that at the current, the carbon budget would be exhausted in less than four years.

Nations agreed at the 2015 UN climate talks in Paris to keep global warming "well below" 2C above pre-industrial levels, while pursuing efforts to limit it to 1.5C.

But the United Nations declared in September that the long-term 1.5C target would be missed in a matter of years.

Scientists say it is crucial to reduce greenhouse gas emissions from fossil fuels to limit the period of "overshoot" above 1.5C and bring temperatures back down as quickly as possible.

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Food Industry Pushes Back on WHO Guidance for Products with Added Color, Sweeteners

Around 11 million deaths a year are linked to unhealthy diets, according to the agency, based on data from a global study. (Getty Images)
Around 11 million deaths a year are linked to unhealthy diets, according to the agency, based on data from a global study. (Getty Images)
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Food Industry Pushes Back on WHO Guidance for Products with Added Color, Sweeteners

Around 11 million deaths a year are linked to unhealthy diets, according to the agency, based on data from a global study. (Getty Images)
Around 11 million deaths a year are linked to unhealthy diets, according to the agency, based on data from a global study. (Getty Images)

Governments should consider regulating foods that include added colors, flavors or sweeteners designed to make the product more appealing to consumers, according to new draft World Health Organization guidance that has sparked swift pushback from the food industry.

The WHO draft aims to help governments identify which foods should be consumed in moderation as part of a healthy diet – and which products could be subject to measures like warning labels or taxes, depending on national priorities.

The new draft food-profiling model, published last week, marks the first time the UN health agency has included this type of ‌ingredient in its guidance, ‌previously only focused on nutritional content, including fat and salt.

“This draft ‌goes ⁠beyond traditional nutrient ⁠profiling by recognizing that foods may need to be considered not only for their nutrient content, but also for other aspects of their formulation” in order to prevent diet-related disease, said Katrin Engelhardt, technical officer at the WHO's department of nutrition and food safety.

Around 11 million deaths a year are linked to unhealthy diets, according to the agency, based on data from a global study.

The proposed new model is also the WHO’s attempt to guide member states through an increasingly polarized debate ⁠about ultra-processed foods (UPFs), a class of food or drink made using processing ‌techniques, additives and industrial ingredients, which often contain little ‌whole food. Examples include carbonated soft drinks or instant noodles.

BEYOND NUTRIENTS ALONE

Many food scientists say UPFs pose ‌numerous health risks but others – and the food industry – say they are defined too widely, ‌which risks demonizing healthy products.

The International Food and Beverage Alliance, an organization representing major multinational food and beverage companies, said it was concerned the proposed approach shifts attention away from nutritional quality and could capture more products for potential regulation.

"Of particular concern is the potential to undermine established nutrition priorities and reformulation ‌efforts,” said IFBA Secretary General Rocco Renaldi.

Other concerns for the food industry are higher costs from reformulating products or stringent labelling requirements, as well ⁠as the risk ⁠of class-action lawsuits as seen in the United States, and higher taxes for processed food companies.

Broadly, the WHO said the model covers “industrially-produced foods to be consumed in moderation” and is a bridge between its healthy diet recommendations and government policy on individual food products.

Lindsey Smith Taillie, co-director of the Global Food Research Program at the University of Chapel Hill, North Carolina, said the point of the model was to target unhealthy foods, combining both nutrients and UPFs.

“These two frameworks have never been mutually exclusive and can and should be used by policymakers as the starting place,” she said, adding that healthiness is measured by multiple criteria.

Kraft Heinz CEO Steve Cahillane last week told Reuters that industry players should have a say.

"We're in the food business and we care about consumers deeply," Cahillane said. "And so we ought to have a seat at the table as these discussions evolve."

The WHO proposal is out for consultation until November 27.

Varieties

Pakistan Farmers in Long Fight to Make German Firms Pay for Flood Damage

Dozens of Pakistani farmers are suing German firms RWE and Heidelberg Materials in a rare bid to make big polluters pay damages for climate impacts. Aamir QURESHI / AFP
Dozens of Pakistani farmers are suing German firms RWE and Heidelberg Materials in a rare bid to make big polluters pay damages for climate impacts. Aamir QURESHI / AFP
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Pakistan Farmers in Long Fight to Make German Firms Pay for Flood Damage

Dozens of Pakistani farmers are suing German firms RWE and Heidelberg Materials in a rare bid to make big polluters pay damages for climate impacts. Aamir QURESHI / AFP
Dozens of Pakistani farmers are suing German firms RWE and Heidelberg Materials in a rare bid to make big polluters pay damages for climate impacts. Aamir QURESHI / AFP

In a Pakistani village nestled in rice fields, Abdul Hafeez Khoso remembers the vast industrial zones he saw in Germany when he visited to file a pioneering climate legal case.

"They're spreading pollution: up in the sky there are no borders, it can affect anywhere," the 43-year-old said, describing areas far larger than his village of 800 people.

"This is a problem for the whole world -- that is why it should be resolved at the global level."

Khoso and 38 other farmers from Pakistan's southern Sindh province who were devastated by "apocalyptic" flooding in 2022 are suing German energy firm RWE and cement maker Heidelberg Materials in a rare bid to make big polluters pay damages for climate impacts.

The companies are being targeted not over specific operations in Pakistan, but because of their climate-warming emissions. They are headquartered in Germany, where a recent legal case opened the door to such suits.

The litigation argues that the companies' emissions contributed to climate change and turbo-charged rain that wiped out their crops, livestock and homes.

"The year 2022 was an apocalyptic scene -- not even our elders had ever witnessed such weather," Khoso, who lives in the district of Jacobabad with his wife and toddler, told AFP.

"We had nothing left."

Both firms, which the plaintiffs estimate contributed 0.68 percent and 0.12 percent to global industrial emissions respectively, deny wrongdoing.

Khoso's case is backed by Pakistani and European organizations hoping to win compensation and build on nascent but vigorous international efforts to extract climate damages from corporations.

"We always blame natural disasters, and sometimes we blame God, but science tells us that climate change is increasing the risks and intensity of extreme weather events," said Mir Keerio, a development expert at Pakistan's HANDS Welfare Foundation, which mobilized communities for the lawsuit.

"Those who have contributed significantly to this crisis must be held accountable... we realized we must take our fight for climate justice to the major polluters."

- Debt and damages -

Climate litigation is a growing field globally, but action has so far largely targeted governments, with only a handful of firms such as Shell and cement maker Holcim facing suits for climate disaster compensations.

Lawyers say a ruling requiring a company to pay out compensation proportionate to its greenhouse gas emissions would mark a major breakthrough.

Germany's judiciary moved towards that principle last year in a case brought by a Peruvian farmer, also against RWE.

His compensation claim was rejected, but the courts left the door open to holding emitters liable.

Roda Verheyen, a German lawyer involved in both cases, told AFP the Pakistani farmers' lawsuit builds on that ruling and further accuses companies of "wrongful behavior".

"Large companies knew about the general impacts of climate change since the 1960s," said Verheyen.

"They should have exercised due diligence and actually at least tried to reduce emissions, which they didn't do enough."

The lawsuit also draws on research documenting farmers' losses in the floods, which hit a third of the country, killed 1,700 and affected 30 million Pakistanis.

Munawar Khatoon, a rare female landowner in a conservative area, said the floods struck just before the wheat harvest, submerging seeds and wiping out her family's main source of income.

"We worry about how the next generation will manage to live if this continues," the 43-year-old told AFP in her village Usman Samtio.

"Now when the rainy season comes, we feel fear."

In nearby Dadu district, litigant Abdul Khalique Laghari said the floods affected the region for years.

"To this day, we are unable to repay our debt," said the 55-year-old, who estimates he lost $14,000 in assets including his house, 40 acres (16 hectares) of crops and livestock.

"When we wake in the morning, we start getting calls from the people we owe money to," he said, pointing to crumbling walls and the remnants of flood-damaged houses.

"This has caused us serious mental harm."

- 'For justice' -

RWE and Heidelberg Materials both call the claims in the suit "unfounded".

Heidelberg Materials told AFP its operations were compliant with German laws and that firms could not be expected to retroactively face different standards.

RWE referred AFP to a statement describing the lawsuit as "yet another attempt to shift climate policy demands to German courtrooms".

"It would be a contradiction in terms if the state allowed CO2 emissions, regulated them by law and even demanded them in some cases, but at the same time allowed retroactive civil liability for them," it said.

Even if the case succeeds, an uphill battle remains for millions across Pakistan, ranked among the countries most affected by climate change despite contributing less than one percent of global emissions.

The case will be considered in a civil process likely to take years. But for the litigants, the attempt is worth it.

"This case is for justice," said Khatoon. "We hold these companies responsible for our destruction."