It sure sounds promising, but it'd be good to see some more efficiency numbers. All there is in the article is this:<p>"A one-liter reactor full of Nocera’s bacteria can capture 500 liters of atmospheric CO2 per day, he said. For every kilowatt hour of energy they produce, they’ll remove 237 liters of CO2 from the air."<p>By my reckoning that works out to about 80 watts, continuous. Solar irradiance is roughly a kilowatt per square meter, so to get 80 watts at 10% efficiency you need nearly a square meter, which leaves your 1-liter reactor stretched to a millimeter thick. Hard to imagine a 1mm thick mat of bacteria absorbing 10% of the light.<p>The limiting factor really is area, not volume. By that metric, solar panels are still twice as efficient. Still, it would be good to have solar panels that grow themselves!