Gastropod · Cynthia Graber and Nicola Twilley

Yes, You Really Can Make Food From Thin Air—And We Tried It

November 4, 2025·48 min·3 clips

Every calorie you've ever eaten is made of just four elements — carbon, hydrogen, oxygen, and nitrogen.

First comes the knife. Cynthia and Nicola open with bread, a plate, and a butter that feels like science fiction because it was made from air. Then the question gets bigger: could humans get nourishment from the same stuff everyone breathes? Colin's DARPA brief was not some loose lab puzzle. The system had to move, work near the front lines, pull in hundreds of meters cubed of air per day, scrub out carbon dioxide, and send that captured carbon toward a bioreactor. Chemistry comes first. Carbon dioxide has to be broken into smaller molecules like formate, acetate, and propionate before microbes can use it. Humans cannot eat those molecules straight. So the project asks microbes to turn them into more complex materials, including glucose. That takes trial and error. Colin's team has to find the right organisms, drop the ones that fail, and use genetic engineering where it helps. The engineering problem is upside down too. Carbon capture usually thinks big, around power plants. Here it has to fit in the back of a truck. The episode becomes a food story about air processing, catalysts, chemical reactions, and microbial handoffs, with one very Gastropod catch: nobody has made a tomato this way, and nobody wants a world without tomatoes. The promise is narrow, strange, and real. Air made food may help feed humans, but it is not coming for everything delicious and plant shaped.

As heard by us

Gastropod turns air-made butter into a sharp, grounded tour of carbon capture, microbes, and the limits of future food.

Gastropod opens with a neat provocation: Cynthia Graber and Nicola Twilley tasting spreadable, meltable butter made from air. From there, the episode widens into a serious question about whether carbon dioxide, chemistry, and carefully chosen microbes can turn what surrounds us…

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Why you'd press play

Butter from air, explained without losing the wonder.

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