What's behind cultured meat's sustainability promise?

Investors are pouring billions  of dollars into companies that hope to commercialise plant-based meat substitutes and cultured meats, produced by fermentation. They are many times hailed as a greener alternative to animal agriculture. But how exactly is cultured meat produced and how likely is to save the planet? NNB North American editor Dale Buss has been digging into this area and he discusses what he has found with Julian Mellentin.