Mango Materials

The Easterly Wastewater Treatment Plant in Vacaville does what wastewater plants have always done. It takes the bad stuff and tries to make it less bad. What it has never done before, until very recently, is sell its breath. A pipe runs out of the plant and into a low building next door. Inside that building, tanks hum. Inside the tanks, bacteria the size of bad ideas are doing the most ordinary thing in the world. They are eating. They are eating methane - the same warming gas that, two days ago, would have been vented into the sky to add a little extra to a hot planet's hot summer. Today it becomes the lunch of a microbe. Tomorrow it becomes a sandbox toy.

This is Mango Materials. It is twenty-two people. It has roughly twelve and a half million dollars in revenue, give or take a polite estimate. It has a B Corp seal, an Unreasonable seal, and a logo that is, with the help of an emoji, a mango. The company has been at this since 2010, which is approximately a hundred years in startup time and an eyeblink in materials-science time. Most of those years were quiet. Most of those years were a Ph.D. lab pretending to be a company. The years after 2023 were not quiet. They were when the pipe got hooked up, the tanks got full, and the world's first methane-to-PHA launch facility cut a ribbon.

PHA is polyhydroxyalkanoate, which is a long name for a short idea. Bacteria store energy as little plastic-like granules inside themselves. Press the right buttons and you can convince them to store a lot of those granules. Crack them open, wash the granules out, dry them, compound them, and you have pellets. Real pellets. The kind that go into injection-molding machines and come out as combs, sunglasses, films, fibers, or beach toys. The same kind of pellets that fossil fuels make, except these pellets are made of last week's methane and they go away when you bury them. Soil. Freshwater. Seawater. They biodegrade in all three, which is a sentence almost no other plastic on Earth can claim.

The strange thing about Mango Materials is that the pitch is almost too neat. The world has too much methane. The world has too much plastic. One company says: those are not two problems, they are one solution that hasn't been built yet. You will hear that pitch and your eyebrows will go up. They went up at the Department of Energy too. They went up at BioMADE. They went up at Allbirds, who put the material into the M0.0NSHOT - a sneaker that claims, with auditing, net-zero carbon. They went up at Stella McCartney, who at COP28 displayed sunglasses with Mango bio-PHA frames. They went up at Natura. The eyebrows are now down. The pellets are now shipping.

If you stand at the Easterly Wastewater Treatment Plant on a clear afternoon, you can still smell what a wastewater plant smells like. The pipe is not glamorous. The tanks are not glamorous. The bacteria are too small to be photogenic. The Mango Materials launch facility looks, from the parking lot, like exactly what it is - a small industrial building next door to a slightly smellier industrial building.

But the small building has changed the smell. A portion of the methane that used to vent into a sky that did not need it is now going somewhere else. It is going into pellets. The pellets are going onto trucks. The trucks are going to Allbirds, and to Stella McCartney's pattern-room, and to Natura's manufacturing partners, and lately to a beach in Northern California where a child is sifting sand with a YOPP scoop that, when the family forgets to bring it home, will eventually be eaten by the same kind of bacteria that made it. The plastic will return to where it came from. The methane will not warm the sky. The child, in the meantime, will keep sifting sand.

It is a very small loop. It is a very large idea. And it is, finally, a real product on a real shelf - which is the moment, in any story about materials science, where the story stops being about chemistry and starts being about chairs, cups, sneakers, and sandbox toys. The pipe at the edge of the plant looks the same. The plant on the other end of the pipe does not.