The study, led by researchers at Oxford and Radboud Universities, compared the environmental impact and nutritional content of beef and spirulina and found that the latter requires significantly less land, water, and energy to produce, while also generating far lower levels of greenhouse gases.
The team calculated that replacing just 20% of the beef currently consumed in the US would require an area of land roughly equivalent to the size of Colorado.
Spirulina is a type of blue-green algae, rich in protein, vitamins, and minerals, and one of the most nutrient-dense foods on the planet. It is also remarkably fast-growing, requiring just a few days to double in mass, and can be grown in a variety of environments, including in vertical farms and desert areas.
The researchers acknowledge that while spirulina is not a perfect substitute for beef in terms of taste and texture, they suggest it could be used as a key ingredient in a variety of plant-based meat alternatives, which would allow consumers to enjoy the flavor and texture of meat without the environmental impact.
"Our study shows that replacing just a small fraction of beef consumption with spirulina could have a major positive impact on the environment," says lead researcher Joseph Poore. "We believe spirulina has the potential to become a key player in sustainable food systems, and we hope our findings encourage others to explore its use in plant-based meat alternatives."
The study is published in the journal Nature Sustainability.
