Tim De Chant@tdechant /
Combine harvesting soybeans

Image Credits: BanksPhotos (opens in a new window) / Getty Images

It almost sounds too good to be true, if you take basalt dust that is wasted in the manufacturing of asphalt shingles, sprinkle it on farmers' fields, and it raises crop yields while also removing carbon dioxide from the atmosphere.

There is a catch.

Farmers need to add just the right amount of basalt. They don't capture much carbon and their crops don't benefit from it. Too much could cause the field to release carbon. The soil is a complex system.

They think they have cracked the code. In the U.S. Midwest and Southeast, they have already captured over 2000 tons of carbon this year.

The startup just announced a $6.3 million seed round that was led by Union Square Venture and Greylock Partners. Greylock and Bain have never invested in climate.

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