Probably is referencing the reverse Krebs cycle, which can be used to build up organic molecules from free H2 and CO2 by anaerobic bacteria. > "The ‘reverse’ K

Probably is referencing the reverse Krebs cycle, which can be used to build up organic molecules from free H2 and CO2 by anaerobic bacteria. > "The ‘reverse’ Krebs cycle was first proposed in 1966. It does exactly the opposite; it uses energy to react the gases hydrogen and carbon dioxide to make Krebs-cycle intermediates, turning simple gases into the molecules of life. The bacteria that live this way are a billion years older than the first photosynthetic cyanobacteria and thrive in environments where life might have started, such as hydrothermal vents." https://www.ukri.org/blog/understanding-the-origins-of-life-helps-address-major-challenges/ https://www.ukri.org/blog/understanding-the-origins-of-life-...