In recent weeks, a crew of staffers from a company called Charm Industrial have been working on the edge of Kansas corn fields, moving rolled bales of stalks, leaves, husks, and tassels up to a white semi-trailer.

Inside, a contraption called a pyrolyzer uses high temperatures in the absence of oxygen to break down the plant material into a mix of biochar and bio-oil. The former will eventually go back into fields, adding carbon and nutrients to the soil. 

But the company pumps the oil down EPA-regulated deep wells used for industrial waste, or into salt caverns left behind by oil and gas companies. Charm says it solidifies there, locking away carbon for thousands to millions of years that would otherwise go back into the air as farmers burn crop remains or leave them to rot.

Companies like Microsoft, Shopify, and Stripe pay Charm $600 for every ton of carbon it puts underground, either to offset their own emissions or to help build up an industry that will need to play a critical part in tempering climate change, by pulling huge amounts of greenhouse gas out of the air and storing it away.

The San Francisco startup has been sequestering carbon this way for the past two years. Late last year, the company announced that the process has safely locked up nearly the equivalent of 5,500 tons of CO2 so far, claiming that’s the largest amount of long-term carbon removal delivered to date. But it’s a tiny sliver of the billions of tons per year that climate scientists warn the world may need to suck up in the coming decades to pull the warming planet back into a safer zone. And there are plenty of questions and concerns about how reliable, scalable, and economical this approach will prove to be.

The company has edged ahead of others mainly because it’s taking a simple approach. It leans on agricultural crops to capture the carbon and uses existing formations for storage. And Charm doesn’t have to construct big projects, sidestepping some of the development, permitting, and capital challenges that startups like Climeworks or Carbon Engineering have encountered as they try to build carbon-sucking factories.

But an early lead in a field that scarcely exists doesn’t necessarily say much about how the company will fare as the market develops. Notably, the next generation of direct-air-capture plants coming online are meant to remove a million tons a year, 180 times more than Charm has achieved so far.

The company will also face some obvious challenges as it scales, including the rising costs of shipping waste between fields and wells, competing demands for the agricultural byproducts it relies on, and questions around how much net carbon its approach ultimately removes.

In addition, the company will face the same risk as other young companies in carbon removal and storage: they’re gambling that large corporations will be willing to continue footing the high bill for cleaning up the atmosphere, and that

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By: James Temple
Title: Inside Charm Industrial’s big bet on corn stalks for carbon removal
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Published Date: Thu, 26 May 2022 09:00:00 +0000