The little germs devour the brew, turning it into commercial-grade compounds like acetate.
This is the base chemical in everything from plastics and cosmetics to paint.
Again is hush-hush about the name of its microscopic crusader, but its bullish on its potential.
The company claims its CO2 fermenter can cut the greenhouse gas emissions of chemical-making by up to 80%.
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The company also claims its product is cost-competitive with the same chemicals made using fossil fuels.
The facility is located at an industrial wastewater treatment plant which produces large quantities of the potent greenhouse gas.
Armed with fresh funding, Again is looking to locate its bioreactor at sources of waste CO2 across Europe.
These machines will produce acetate as well as other valuable chemicals.
Story bySion Geschwindt
Sion is a freelance science and technology reporter, specialising in climate and energy.
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