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Meat, milk alternatives could slash food system emissions a third: study

September 17, 2023
in Science
Meat, milk alternatives could slash food system emissions a third: study
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Cows belch methane, a potent greenhouse gas whose warming effect is much stronger than carbon dioxide

Cows belch methane, a potent greenhouse gas whose warming effect is much stronger than carbon dioxide.

Replacing half of the pork, chicken, beef and milk products we consume with plant-based alternatives could reduce global greenhouse gas emissions from agriculture and related land use by nearly a third, and virtually halt forest loss, according to research published on Tuesday.

Population growth and higher incomes are on track to increase global demand for these key animal products, which can bring damaging environmental consequences.

Forests are cleared to make way for cattle and the grain needed to feed them, while cows belch methane, a potent greenhouse gas whose warming effect is much more powerful than carbon dioxide.

The study, published in the journal Nature Communications, used modeling to analyze the impact of a worldwide dietary shift towards plant-based alternatives to pork, beef, chicken and milk with the same nutritional value.

It suggested that greenhouse gas emissions connected to agriculture and land use could be cut by 31 percent in 2050 compared to 2020 levels if consumption were reduced by half.

In that scenario, the amount of land dedicated to agricultural uses falls by 12 percent instead of continuing to expand.

The extent of forests and other natural land area would remain nearly the same as in 2020, as land earmarked for livestock and production of feed is spared rather than burned or cleared.

The increased use of nitrogen for crops is almost half of what it would otherwise be on expected trends, while water use drops 10 percent.

Use of nitrogen nutrients in the world

Use of nitrogen nutrients in the world.

‘Critical opportunity’

A massive shift to plant-based foods would also improve global food security, with the number of undernourished people falling by 31 million by 2050, the researchers said.

In addition, it would boost biodiversity. Restored land area could contribute between 13 and 25 percent of the estimated land restoration needed by 2030 under a target set in a global treaty hammered out at the end of last year.

The decline of life-sustaining ecosystems on current trajectories would be more than halved by 2050, the study suggested.

“Plant-based meats are not just a novel food product but a critical opportunity for achieving food security and climate goals while also achieving health and biodiversity objectives worldwide,” study co-author Eva Wollenberg said.

Sub-Saharan Africa, China and Southeast Asia would see the biggest reductions in biodiversity losses, while carbon sequestration levels would improve the most in sub-Saharan Africa and South America, notably Brazil.

Freeing up cropland would especially affect China, the world’s top consumer of pork and chicken meat.

Replacing beef alone would provide around half of the emissions reductions achieved through reducing consumption of all four animal products.

The researchers cautioned that such changes should take into account the importance of livestock in some cultures and to small-scale farmers, but noted that climate change also represented a major risk to them.

The pricing of plant-based products will greatly determine the evolution of the market, while the speed and fairness of the change will depend much on public policies, they said.

More information:
Marta Kozicka, Feeding climate and biodiversity goals with novel plant-based meat and milk alternatives, Nature Communications (2023). DOI: 10.1038/s41467-023-40899-2. www.nature.com/articles/s41467-023-40899-2

© 2023 AFP

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Meat, milk alternatives could slash food system emissions a third: study (2023, September 16)
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