In addition to burying stable carbon or sprinkling it on fields, researchers are additionally turning waste biomass into liquid carbon—oil, basically, that they pump again into the bottom as a substitute of pumping the fossil selection up. “What we do at the highest level is we make barbecue sauce—or liquid smoke for barbecue sauce—and then we inject it into old oil wells,” says Peter Reinhardt, CEO and cofounder of the carbon elimination firm Charm.

They additionally do that with pyrolysis, which spits out stable char for agriculture, but in addition liquid oil. That’s shipped to deserted wells and pumped underground, the place it solidifies. “There’s about 2 to 3 million abandoned, end-of-life oil and gas wells across the United States,” says Reinhardt. “It’s quite a problem, actually—a lot of them are methane emitters or improperly sealed, with fluid leaking up to the surface.” By pumping its biomass oil underground at these websites, Charm each sequesters carbon and seals up wells which were leaking greenhouse gases.

Whatever the tip product, biomass elimination cleverly exploits nature’s personal photosynthesis to sequester after which bury carbon. “The genius in this business model, in many ways, is letting nature do most of the work,” says local weather economist Gernot Wagner of the Columbia Business School. “This is a natural process that’s been perfected over millions of years, so why not take advantage of it?”

In actuality, although, issues are extra sophisticated, Wagner says. When fossil gasoline corporations take away coal or oil from the earth, they’re tapping into big deposits which can be comparatively simple to use on a budget, therefore the costs of these fuels stay low. But there’s solely a lot biomass waste accessible above floor, and it’s distributed throughout the planet. (Though this can be a potential energy of this sort of carbon elimination, in that every municipality may course of its personal biomass waste for storage.) “The more demand there is for biochar, or for this kind of carbon removal technology, the more startups are out there clamoring for the same food waste, corn husk waste, and so on,” says Wagner. “Suddenly, the prices increase, rather than decrease.”

The different potential subject, Wagner says, is the “moral hazard”: If humanity is ready to delete carbon from the environment, that’s much less incentive to slash emissions. There’s nonetheless a lot cash to be made in fossil fuels, and certainly, oil corporations like Occidental Petroleum are investing heavily in carbon removal applied sciences like direct air seize, by which machines scrub the air of CO₂. That means, they will carry on drilling. “There is always this moral hazard aspect,” says Wagner. “The big, big topic in the background behind any of these carbon removal conversations is: OK, well, we could—or should, frankly—be doing more to reduce emissions in the first place, as opposed to let’s suck it back out after the fact.”