Deep Branch: turning CO2 into animal feed

CO2 is a greenhouse gas and the main culprit in climate change, but it’s also a gas with industrial uses. As climate change sharpens our resolve to do something about emissions, all kinds of new uses for CO2 have been emerging. There are companies that are tapping waste gas streams to make building materials, fertiliser or plastic. Here’s another. Deep Branch is a biotech company that makes CO2 into protein.

The process uses gas fermentation. Microbes are fed a diet of CO2 and hydrogen from an e...