Oh, but you are looking at this way too simplistically.

Sustainability means being able to sustain a particular practice in perpetuity from a resource perspective. I would also ad that it shouldn't have any significant detrimental side effects, like harming people's health, which Oatly's products are.

Notice I did NOT say there is anything sustainable with producing conventional dairy in the way and scale it is currently being produced.

The problems surrounding this issue are so complex that I couldn't begin to adress them here.