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Eat grass-fed beef, help the planet? Research says not so simple

MELINA WALLING
March 17, 2025

For cattle fattened in fields instead of feedlots, the grass may be greener, but the carbon emissions are not.

A study out Monday in the Proceedings of the National Academy of Sciences finds that even in the most optimistic scenarios, grass-fed beef produces no less planet-warming carbon emissions than industrial beef. The finding calls into question the frequent promotion of grass-fed beef as a more environmentally friendly option. Still, other scientists say grass-fed beef wins out on other factors like animal welfare or local environmental pollution, complicating the choice for conscientious consumers.

"I think that there is a large portion of the population who really do wish their purchasing decisions will reflect their values," said Gidon Eshel, a research professor of environmental physics at Bard College and one of the study's authors. "But they are being misled, essentially, by the wrong information."

When it comes to food, beef contributes by far the most emissions fueling climate change and is one of the most resource- and land-intensive to produce. Yet demand for beef around the world is only expected to grow. And carefully weighing the benefits of grass-fed beef matters because in most parts of the world where beef production is expanding, such as South America, it's being done by deforesting land that would otherwise store carbon, said Richard Waite of the World Resources Institute.

Experts say this study's finding makes sense because it's less efficient to produce grass-fed cattle than their industrial counterparts. Animals that are fattened up in fields instead of feedlots grow more slowly and don't get as big, so it takes more of them to produce the same amount of meat.

The researchers used a numerical model of the emissions produced across the process of raising beef, then simulated many herds of industrial and grass-fed cattle. It compared differences in how much food they would eat, how much methane and carbon dioxide they would emit and how much meat they would produce. Those differences mirror real-life scenarios; cattle in arid New Mexico and lush northern Michigan have different inputs and outputs.

Eshel and his team also analyzed previous studies that examined how much cattle grazing promotes carbon storage, but found that even in the best-case scenarios, the amount of carbon that grasses could sequester didn't make up for the emissions of the cattle.

Randy Jackson, a professor of grassland ecology at University of Wisconsin-Madison who was not involved in the study, said he has found similar results in his own research showing that grass-fed beef has higher emissions assuming the same demand. In fact, Eshel's team cited his work. But he worries that the study is too focused on minimizing emissions "without concern for the environmental impacts beyond GHG load to the atmosphere," like biodiversity and soil and water quality, he wrote in an email.

The American Grassfed Association, a nonprofit membership group for producers of grass-fed livestock, did not immediately provide a comment on the study.

Jennifer Schmitt, who studies the sustainability of U.S. agricultural supply chains at the University of Minnesota and also wasn't involved in the study, said she thinks the paper "helps us get a little closer to answering the question of maybe how much beef should we have on the landscape versus plant proteins," she said.

Schmitt said maybe if beef was scaled back on a large enough scale and if farmers could free up more cropland for other foods that humans eat, the localized environmental benefits of grass-fed cattle could make up for the fact that they come with higher emissions.

It would be harder to convince Eshel, however. He thinks climate change is "second to none" when it comes to global problems and should be prioritized as such.

"I have a hard time imagining, even, a situation in which it will prove environmentally, genuinely wise, genuinely beneficial, to raise beef," Eshel said.

For consumers who truly want to be environmentally conscious, he added, "don't make beef a habit."

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Follow Melina Walling on X @MelinaWalling and Bluesky @melinawalling.bsky.social.

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The Associated Press' climate and environmental coverage receives financial support from multiple private foundations. AP is solely responsible for all content. Find AP's standards for working with philanthropies, a list of supporters and funded coverage areas at AP.org.

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