Boeing has signed a deal with startup Charm Industrial to remove 100,000 metric tons of carbon from the atmosphere.

Charm collects agricultural and forestry waste and uses heat to turn it into a product it calls “bio-oil,” a messy jumble of hydrocarbons that it injects underground, including into former oil wells. Once sequestered, Charm can sell carbon removal credits to companies. Axios first reported on the startup’s deal with Boeing.

Aviation has made little progress on cutting its carbon emissions. That has left companies in the sector searching for alternatives. Carbon removal has emerged as a contender given that it has the potential to cost less than transitioning to sustainable aviation fuels.

By 2050, one study found that the aviation industry will need to spend at least $

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