But you have to feed the cells. And you can't just grow some plants and feed it to the cells, you have to manufacture a very precise blend of chemicals (amino

But you have to feed the cells. And you can't just grow some plants and feed it to the cells, you have to manufacture a very precise blend of chemicals (amino acids, sugars, surfactants, antioxidants, etc.) at >99% purity for each one. Often extremely nasty solvents are involved in the production process. Usually, some sort of petroleum product is a feedstock. Those chemically synthesized materials are hardly green.