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As we reflect on the wonder of migratory birds, and the spotlight focuses on how our cities and communities can be made more bird-friendly, we must also consider how our food system is posing a threat to their very existence.
For migratory and other wild birds, bird flu is a disaster. The U.S. Centers for Disease Control and Prevention, or CDC, states that 169 million U.S. poultry have been affected by highly pathogenic bird flu since January 2022. Yet worldwide, tens of millions of wild birds have died of bird flu—which has also spread to mammals, including over 1,000 US. dairy herds.
Saturday 10 May is World Migratory Bird Day, a global event for raising awareness of migratory birds and issues related to their conservation. The poultry industry and governments like to blame wild birds for bird flu. However, the Scientific Task Force on Avian Influenza and Wild Birds—which includes the United Nations Food and Agriculture Organization (FAO) and the World Organization for Animal Health (WOAH) stresses that wild birds are in fact the victims of highly pathogenic bird flu; they do not cause it. As a recent study states, “This panzootic did not emerge from nowhere, but rather is the result of 20 years of viral evolution in the ever-expanding global poultry population.”
Until recently, the bird flu viruses that circulate naturally in wild birds were usually of low pathogenicity; they generally caused little harm to the birds. It is when it gets into industrial poultry sheds—often on contaminated clothing, feed, or equipment—that low pathogenic avian influenza can evolve into dangerous highly pathogenic avian influenza.
Governments worldwide appear to have no strategy for how to end these regular bird flu outbreaks other than to hope they will eventually die down.
Industrial poultry production, in which thousands of genetically similar, stressed birds are packed into a shed, gives a virus a constant supply of new hosts; it can move very quickly among the birds, perhaps mutating as it does so. In this situation, highly virulent strains can rapidly emerge. The European Food Safety Authority warns that it is important to guard against certain low pathogenic avian influenza subtypes entering poultry farms “as these subtypes are able to mutate into their highly pathogenic forms once circulating in poultry.”
Once highly pathogenic avian influenza strains have developed in poultry farms, they can then be carried back outside—for example, through the large ventilation fans used in intensive poultry operations—and spread to wild birds. The Scientific Task Force states that since the mid-2000s spillover of highly pathogenic bird flu from poultry to wild birds has occurred “on multiple occasions.”
So, low pathogenic bird flu is spread from wild birds to intensive poultry where it can mutate into highly pathogenic bird flu, which then spills over to wild birds and can even return back to poultry in a growing and continuing vicious circle.
Following its evolution in farmed poultry, the highly pathogenic virus has adapted to wild birds, meaning that it is circulating independently in wild populations, with some outbreaks occurring in remote areas that are distant from any poultry farms.
While the health risk to humans from bird flu may be low, it cannot be ignored. Highly pathogenic avian influenza has spread to mammals including otters, foxes, seals, dolphins, sea lions, dogs, and bears. Worryingly, it has been found in a Spanish mink farm where it then was able to spread from one infected mink to another.
The U.S. Department of Agriculture has said that cow-to-cow transmission is a factor in the spread of bird flu in dairy herds. The ability for bird flu to move directly from one mammal to another is troubling as a pandemic could ensue if it could move directly from one human to another.
Scientists at Scripps Research reveal that a single mutation in the H5N1 virus that has recently infected U.S. dairy cows could enhance the virus’ ability to attach to human cells, potentially increasing the risk of passing from person to person.
A 2023 joint statement from the World Health Organization, the FAO, and WOAH stated that, while avian influenza viruses normally spread among birds, “the increasing number of H5N1 avian influenza detections among mammals—which are biologically closer to humans than birds are—raises concern that the virus might adapt to infect humans more easily.”
Some mammals may also act as mixing vessels, leading to the emergence of new viruses that could be more harmful.
Pigs can be infected by avian and human influenza viruses as well as swine influenza viruses. Pigs can act as mixing vessels in which these viruses can reassort (i.e. swap genes) and new viruses that are a mix of pig, bird, and human viruses can emerge. The U.S. CDC explains that if the resulting new virus infects humans and can spread easily from person to person, a flu pandemic can occur.
Governments worldwide appear to have no strategy for how to end these regular bird flu outbreaks other than to hope they will eventually die down. There is no sign of this happening. Without an exit strategy we are likely to face repeated, devastating outbreaks of bird flu for years to come. We need an action plan to restructure the poultry and pig sectors to reduce their capacity for generating highly pathogenic diseases.
We need to:
In light of pigs’ capacity for acting as mixing vessels for human, avian, and swine influenza viruses, the pig sector too needs to be restructured to make it less vulnerable to the transmission and amplification of influenza viruses. As with poultry, this would involve reducing stocking densities, smaller group sizes, and avoiding concentrating large numbers of farms in a particular area.
As we reflect on the wonder of migratory birds, and the spotlight focuses on how our cities and communities can be made more bird-friendly, we must also consider how our food system is posing a threat to their very existence. Failure to rethink industrial farming leaves us vulnerable, with the continued devastation of wild birds and poultry, and perhaps even a human pandemic.
A new Food & Water Watch report details how "corporations use the worsening bird flu crisis to jack up egg prices, even as their own factory farms fuel the spread of disease."
The nation's largest egg producers would have American consumers believe that avian flu and inflation are behind soaring prices, but a report published Tuesday shows corporate price gouging is the real culprit driving the record cost of the dietary staple.
The fourth installment of Food & Water Watch's (FWW) Economic Cost of Food Monopolies series—titled The Rotten Egg Oligarchy—reports that the average price of a dozen eggs in the United States hit an all-time high of $4.95 in January 2025. That's more than two-and-a-half times the average price from three years ago.
"While egg prices spiral out of reach, making eggs a luxury item, Big Ag is profiting hand over fist," FWW research director Amanda Starbuck said in a statement. "But make no mistake—today's high prices are built on a foundation of corporate price gouging. Our research shows how corporations use the worsening bird flu crisis to jack up egg prices, even as their own factory farms fuel the spread of disease."
FWW found that "egg prices were already rising before the current [avian flu] outbreak hit U.S. commercial poultry flocks in February 2022, and have never returned to pre-outbreak levels."
Furthermore, "egg price spikes hit regions that were bird flu-free until recently," the report states. "The U.S. Southeast remained free of bird flu in its table egg flocks until January 2025, and actually increased egg production in 2022 and 2023 over 2021 levels. Nevertheless, retail egg prices in the Southeast rose alongside January 2023's national price spikes."
"The corporate food system is to blame for exacerbating the scale of the outbreak as well as the high cost of eggs," the publication continues. "Factory farms are virus incubators, with the movement of animals, machines, and workers between operations helping to spread the virus."
"Meanwhile, just a handful of companies produce the majority of our eggs, giving them outsized control over the prices paid by retailers, who often pass on rising costs to consumers," the paper adds. "This highly consolidated food system also enables companies to leverage a temporary shortage in one region to raise prices across the entire country."
Cal-Maine, the nation's top egg producer, enjoyed a more than 600% increase in gross profits between fiscal years 2021-23, according to FWW. The Mississippi-based company did not suffer any avian flu outbreaks in fiscal year 2023, during which it sold more eggs than during the previous two years. Yet it still sold conventional eggs at nearly three times the price as in 2021, amounting to over $1 billion in windfall profits. Meanwhile Cal-Maine paid shareholders dividends totaling $250 million in 2023, 40 times more during the previous fiscal year.
The report highlights how factory farming creates ideal conditions for the spread of avian flu, a single case of which requires the extermination of the entire flock at the affected facility, under federal regulations.
"These impacts cannot be understated," FWW stressed. "Today's average factory egg farm confines over 800,000 birds, with some operations confining several million. This magnifies the scale of animal suffering and death, as well as the enormous environmental and safety burden of disposing of a million or more infected bird carcasses."
Citing U.S. Department of Agriculture (USDA) figures, The Guardianreported Tuesday that more than 54 million birds have been affected in the past three months alone.
Egg producers know precisely how the supply-and-demand implications of these outbreaks and subsequent culls can boost their bottom lines. Meanwhile, they play a dangerous game as epidemiologists widely view a potential avian flu mutation that can be transmitted from birds to humans as the next major pandemic threat—one that's exacerbated by the Trump administration's withdrawal from the World Health Organization and cuts to federal agencies focused on averting the next pandemic.
"We cannot afford to place our food system in the hands of a few corporations that put corporate profit above all else."
So far, 70 avian flu cases—one of them fatal—have been reported in the United States, according to the U.S. Centers for Disease Control and Prevention. However, under Trump, the CDC has stopped publishing regular reports on its avian flu response plans and activities. The USDA, meanwhile, said it "accidentally" terminated staffers working on avian flu response during the firing flurry under Elon Musk's Department of Government Efficiency. The agency is scrambling to reverse the move.
"We cannot afford to place our food system in the hands of a few corporations that put corporate profit above all else," the FWW report argues. "Nor can we allow the factory farm system to continue polluting our environment and serving as the breeding ground for the next human pandemic."
"We need to enforce our nation's antitrust laws to go after corporate price fixing and collusion," the publication adds. "We also need a national ban on new and expanding factory farms, while transitioning to smaller, regional food systems that are more resilient to disruptions."
That is highly unlikely under Trump, whose policies—from taxation to regulation and beyond—have overwhelmingly favored the ultrawealthy and corporations over working Americans. Meanwhile, one of the president's signature campaign promises, to lower food prices "on day one," has evaporated amid ever-rising consumer costs.
According to the USDA's latest Food Price Outlook, overall food prices are projected to rise 3.4% in 2025. Eggs, however, are forecast to soar a staggering 41.1% this year—and possibly by as much as 74.9%.
"If President Trump has any interest in fulfilling his campaign pledge to lower food prices," Starbuck stressed, "he must begin by taking on the food monopolies exploiting pandemic threat for profit."
For agriculture as with energy, the real climate solutions are being silenced by the corporate cacophony.
I remember being filled with excitement when the Paris agreement to limit global warming to 1.5°C was adopted by nearly 200 countries at COP21. But after the curtains closed on COP29 last month—almost a decade later—my disenchantment with the event reached a new high.
As early as the 2010s, scientists from academia and the United Nations Environment Program warned that the U.S. and Europe must cut meat consumption by 50% to avoid climate disaster. Earlier COPs had mainly focused on fossil fuels, but meat and dairy corporations undoubtedly saw the writing on the wall that they too would soon come under fire.
Our food system needs to be sustainable for all—people, animals, and our planet.
Animal agriculture accounts for at least 14.5% of global greenhouse gas emissions, over quadruple the amount from global aviation. Global meat and dairy production have increased almost fivefold since the 1960s with the advent of industrialized agriculture. These factory-like systems are characterized by cramming thousands of animals into buildings or feedlots and feeding them unnatural grain diets from crops grown offsite. Even if all fossil fuel use was halted immediately, we would still exceed 1.5°C temperature rise without changing our food system, particularly our production and consumption of animal-sourced foods.
But climate change is just one of the threats we face. We have also breached five other planetary boundaries—biodiversity; land-use change; phosphorus and nitrogen cycling; freshwater use; and pollution from man-made substances such as plastics, antibiotics, and pesticides—all of which are also driven mainly by animal-sourced food production.
The 2023 update is shown to the Planetary boundaries. (Graphic: Azote for Stockholm Resilience Centre, based on analysis in Richardson et al 2023/ CC BY-NC-ND 3.0)
By the time world leaders were ready to consider our food system's impact on climate and the environment, the industrialized meat and dairy sector had already prepared its playbook to maintain the status quo. The Conference of Parties is meant to bring together the world's nations and thought leaders to address climate change. However, the event has become increasingly infiltrated by corporate interests. There were 52 delegates from the meat and dairy sector at COP29, many with country badges that gave them privileged access to diplomatic negotiations.
In this forum and others, the industry has peddled bombastic "solutions" under the guise of technology and innovation. Corporate-backed university research has lauded adding seaweed to cattle feed and turning manure lagoons the size of football fields into energy sources to reduce methane production. In Asia, companies are putting pigs in buildings over 20 stories tall, claiming the skyscrapers cut down on space and disease risks. And more recently, Bill Gates and Jeff Bezos started bankrolling research and development into vaccines that reduce the methane-causing bacteria found naturally in cows' stomachs. The industry hopes that the novelty and allure of new technologies will woo lawmakers and investors, but these "solutions" create more problems than they solve, exacerbating net greenhouse gas emissions, air and water pollution, wildlife loss, and freshwater depletion.
Emissions from animal-sourced foods can be broadly divided into four categories: ruminant fermentation (cow burps); manure; logistics (transport, packaging, processing, etc.); and land-use change, i.e., the conversion of wild spaces into pasture, feedlots, and cropland for feed. In the U.S., ruminant fermentation and manure emit more methane than natural gas and petroleum systems combined.
A new report found that beef consumption must decline by over a quarter globally by 2035 to curb methane emissions from cattle, which the industry's solutions claim to solve without needing to reduce consumption. But the direct emissions from cattle aren't the only problem—beef and dairy production is also the leading driver of deforestation, which must decline by 72% by 2035, and reforestation must rise by 115%. About 35% of habitable land is used to raise animals for food or to grow their feed (mostly corn and soy), about the size of North and South America combined.
Thousands of cattle mill about or huddle under shade structures at a large cattle ranch where they spend the last few months of their lives before going to slaughter in Coalinga, California, USA, 2022. (Photo: Vince Penn / We Animals)
Put simply, the inadequate solutions put forth by Big Ag cannot outpace industrialized farming's negative impacts on the planet. While seaweed and methane vaccines may address cow burps, they don't address carbon emissions from deforestation or manure emissions of nitrous oxide, a greenhouse gas over 270 times more powerful than CO2. They also don't address the nitrate water pollution from manure, which can sicken people and cause massive fish kills and harmful algal blooms; biodiversity decline from habitat loss, which has dropped 73% since the rise of industrialized animal agriculture; freshwater use, drying up rivers and accounting for over a quarter of humanity's water footprint; or pesticide use on corn and soy feed, which kills soil microorganisms that are vital to life on Earth.
Skyscrapers, while solving some land-use change, do not consider the resources and the land used to grow animal feed, which is globally about equivalent to the size of Europe. They also don't address the inherent inefficiencies with feeding grain to animals raised for food. If fed directly to people, those grains could feed almost half the world's population. And while the companies using pig skyscrapers claim they enhance biosecurity by keeping potential viruses locked inside, a system failure could spell disaster, posing a bigger threat to wildlife and even humans.
We need both a monumental shift from industrialized agriculture to regenerative systems and a dramatic shift from animal-heavy diets to diets rich in legumes, beans, vegetables, fruits, and whole grains, with meat and dairy as a specialty rather than a staple.
One solution that is gaining traction as an alternative to Big Ag's proposals is regenerative grazing. When done right, regenerative grazing eliminates the need for pesticides and leans into the natural local ecology, putting farm animals onto rotated pastures and facilitating carbon uptake into the soil. Regenerative animal agriculture is arguably the only solution put forward that addresses all six breached planetary boundaries as well as animal welfare and disease risk, and studies suggest it can improve the nutritional quality of animal-sourced foods. While it is imperative to transition from industrialized to regenerative systems, regenerative grazing comes with major caveats. This type of farming is only beneficial in small doses—cutting down centuries-old forests or filling in carbon-rich wetlands to make way for regenerative pastures would do much more climate and ecological harm than good. Soil carbon sequestration takes time and increases with vegetation and undisturbed soil, meaning that any regenerative pastures made today will never be able to capture as much carbon as the original natural landscape, especially in forests, mangroves, wetlands, and tundra. And while regenerative farmlands create better wildlife habitats than feedlots and monocultures, they still don't function like a fully natural ecosystem and food web. Also, cattle emit more methane than their native ruminant counterparts such as bison and deer.
Most notably, however, we simply don't have enough land to produce regeneratively raised animal products at the current consumption rate. Regenerative grazing requires more land than industrialized systems, sometimes two to three times more, and as mentioned the livestock industry already occupies over one-third of the world's habitable land. In all, we have much more to gain from rewilding crop- and rangeland than from turning the world into one big regenerative pasture.
A horned Pineywoods bull watches a white and black spotted Kune Kune pig at a regenerative farm in North Carolina, USA. (Photo: Mike Hansen / Getty Images)
All this brings us to one conclusion—the one that was made by scientists over a decade ago: We need to eat less meat. As Action Aid's Teresa Anderson noted at this year's COP, "The real answers to the climate crisis aren’t being heard over the corporate cacophony."
Scientific climate analyses over the last few years have been grim at best, and apocalyptic at worst. According to one of the latest U.N. reports, limiting global temperature rise to 1.5°C (2.7°F) requires cutting greenhouse gas (GHG) emissions by 57% by 2035, relative to 2023 emissions. However, current national policies—none of which currently include diet shifts—will achieve less than a 1% reduction by 2035. If the 54 wealthiest nations adopted sustainable healthy diets with modest amounts of animal products, they could slash their total emissions by 61%. If we also allowed the leftover land to rewild, we could sequester 30% of our global carbon budget in these nations and nearly 100% if adopted globally.
Our food system needs to be sustainable for all—people, animals, and our planet. Quick fixes and bandages will not save our planet from climate change, biodiversity loss, and pollution. We need both a monumental shift from industrialized agriculture to regenerative systems and a dramatic shift from animal-heavy diets to diets rich in legumes, beans, vegetables, fruits, and whole grains, with meat and dairy as a specialty rather than a staple. As nations draft their policies for COP30, due early this year, we need leaders to adopt real food system solutions instead of buying into the corporate cacophony.