From Andrew Forrest, Epping, Essex, UK
Gege Li reports work to modify bacteria so they consume carbon dioxide instead of sugars (7 December 2019, p 19). This clearly requires energy: that would have to come from the sun or from chemical energy, and supplying the latter generally involves producing CO2. I would hope to see a more critical scientific assessment of the potential of such technology to remove CO2 from the atmosphere.
