German researchers at the University of Tübingen have successfully farmed yeast rich in protein and vitamin B9 by feeding them hydrogen, oxygen, and carbon dioxide. This innovative system, operating on renewable energy, seeks to provide a sustainable protein alternative to conventional agriculture. With the world's population approaching 10 billion and challenges like climate change and limited land resources looming, the need for efficient food production is crucial. The proof-of-concept involves a 2-stage bioreactor process where a bacterium converts CO2 and H2 into acetate, which is then utilized by baker’s yeast to produce protein and vitamin B9. The resulting dried yeast, once treated to remove nucleic acids, is a high-protein and folate-rich product comparable to traditional protein sources like beef, pork, fish, and lentils. The researchers envision scaling up this climate-friendly protein production method but stress the importance of further research to optimize production, ensure food safety, and conduct economic analyses before introducing the product to the market.