Dual role of citric acid: facilitate the bioconversion of CO

Summary: Scientists are looking for ways to turn harmful carbon monoxide (CO) gas into useful things like fuel and chemicals. They found that a common ingredient called citric acid—the same sour stuff found in lemons—does a double job to help! It makes it much easier for special bacteria to "eat" the toxic gas and transform it into valuable green products. This discovery could be a great step forward for cleaning up pollution and creating sustainable energy.