New Biochar Plant Turns California’s Agricultural Waste into Climate Solution

New Biochar Plant Turns California’s Agricultural Waste into Climate Solution

By
Drew Campbell

Publish Date:December 5, 2025

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📰 The quick summary: CarbonZero.Eco has launched its first commercial biochar plant in California and secured a carbon removal agreement with Climeworks, transforming agricultural waste into a soil-enhancing product that stores carbon long-term.
📈 One key stat: The biochar treatment will contribute to 20% more water being retained in soils, reaching the critical threshold needed to stop depleting water reservoirs.
💬 One key quote: “This facility represents a major step toward making carbon-negative agriculture both practical and profitable. By placing our first plant directly where agricultural waste is generated, we’re creating a closed-loop system that benefits farmers, the environment, and the climate.”

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1️⃣ The big picture: Silicon Valley-based startup CarbonZero.Eco has launched its first commercial biochar facility in California while simultaneously announcing a landmark carbon removal credits purchase agreement with industry leader Climeworks. Founded by 17-year-old Harper Moss, the company converts CO2-dense agricultural waste from almond farming into biochar, a carbon-rich soil amendment that provides long-term carbon storage. The company emerged from stealth mode last year with multi-million-dollar backing from senior leaders at major tech companies including Google, Meta, and Amazon. By transforming agricultural waste that would otherwise decompose and release greenhouse gases, CarbonZero.Eco aims to remove up to 1.5 million tons of CO2 while creating valuable products for local farmers.

2️⃣ Why is this good news: This innovative approach creates a win-win solution for both climate action and agriculture by transforming waste into a valuable resource. The biochar not only sequesters carbon for hundreds to thousands of years but also significantly improves soil health and water retention capabilities in drought-prone California. By targeting the half million tons of almond shells currently being burned or left to decompose in California’s Central Valley, the company eliminates a major source of emissions while returning carbon to farmland in a beneficial form. The strategic placement of the facility next to almond shell stockpiles creates a closed-loop system that eliminates transportation emissions and demonstrates how carbon removal can be integrated directly into existing agricultural systems.

3️⃣ What’s next: The company will now focus on distributing its biochar product to partner farms across Colusa and Yolo Counties where it will be blended into compost. CarbonZero.Eco plans to use the Climeworks partnership to generate carbon removal credits that verify the climate benefits of their process. With their established network of hundreds of almond farmers in California, the company is positioned to rapidly scale their biochar production and carbon removal capacity.

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Read the full story here: Carbon Herald – CarbonZero.Eco Lauches Its First Commercial Biochar Plant & Secures A CDR Deal With Climeworks

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