Charm delivers Stripe's carbon removal purchase ahead-of-schedule

From the press release:

Stripe purchased 416 tons CO₂e in carbon removal from Charm in May 2020, as our very first customer. That carbon is now permanently sequestered in geological storage.

Here is a bit more about the technology from their faqs:

Bio-oil is produced through a process called “fast pyrolysis” where biomass like wood, corn stover, rice straw, or almond shells is heated up to about 500°C in a few seconds without any oxygen present. This process produces a liquid mixture called bio-oil and a solid mixture of ash (like in a fireplace). The ash is a useful potash fertilizer. Bio-oil is sometimes used as a fertilizer but mostly as a low-value fuel. Chemically it is a mixture of acids, aldehydes, ketones, sugars, phenols, and other organic compounds derived from the decomposition of biomass cellulose.

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Today our bio-oil is produced from excess sawdust and wood that would have rotted otherwise. In the future we expect to use waste agricultural residue. For example, corn stover, rice straw, sugar cane bagasse and almond shells.

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We’ve developed a new, patent-pending method for negative emissions: convert biomass to bio-oil, prepare the bio-oil for injection, and inject it deep underground. Bio-oil is produced through fast pyrolysis of waste biomass, then transported to an injection well, prepared for injection, and pumped underground. In the US these injection wells are typically EPA Class I or Class V wells. The process effectively takes atmospheric CO₂, captures it in biomass, converts the biomass to a liquid similar to crude oil but with half the energy content, and injects it into rock formations that have stored crude oil for hundreds of millions of years.