This is a promising area of technology for agriculture. It's also, actually, a very promising area of technology for the production of CO2-neutral hydrocarbon

This is a promising area of technology for agriculture. It's also, actually, a very promising area of technology for the production of CO2-neutral hydrocarbon fuels (hydrocarbon fuels where all of the carbon content comes from atmospheric CO2, thus producing no net atmospheric CO2 upon combustion). This is not quite as far along as the headline suggests, but it's still super cool. What the lab actually did was build an electrolyzer to produce acetate from CO2 + water (+ electricity), and then find organisms that they could feed the acetate to. They had the most success growing yeast (1/18th the energy requirements of biological photosynthesis), but also had success with algae and fungal mycelium with lower efficiency gains. That's not exactly the same as actually producing food -- the algae production in particular is likely quite useful for less-inefficient biofuel production, but not exactly for eating. They anticipate having success with a few actual food crops that they believe they can breed to thrive without sunlight but with their electrolyzed acetate -- in particular tomato, canola, and rice -- which, presuming the resulting plants were similarly productive and similarly nutritious would actually be progress on the food-production front.