This is an ad.

And not a good one, either. "Precision fermentation 'could end the climate crisis'" is such a bullshiat heading that I can't even begin to froth at it. Never mind the simple, obvious issue that they've bred a genetically-modified yeast strain that produces casein, but fails to answer the question "...from what?"

When a brewer adds yeast to make beer, they're adding a micro-organism that consumes sugars available in the wort or mash and turns them into carbon dioxide and alcohols. What is the yeast consuming to produce casein (C₁₈H₁₂₅N₂₂₀O₃₉P)? What else does it produce? Is the yeast strain viable in the wild?

The article claims they feed it "sugar and oxygen." Where are they getting the nitrogen and phosphorus? Or that much hydrogen? Glucose (C₆H₁₂O₆) has nowhere near enough hydrogen for that reaction's proportions without dispensing a lot of carbon in the process, even if they're adding water into that equation.

There's bullshiat here - I'd be curious to find out what their waste products look like, and where they're going. Even a perfect reaction would require a shiatload of supplemental nitrogen and hydrogen, and "sugar and oxygen" aren't providing any farking phosphorus at all.