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In page Biochar:

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The Amazonian pit/trench method,[9] in contrast, harvests neither bio-oil nor syngas, and releases CO2, black carbon, and other greenhouse gases (GHGs) (and potentially, toxicants) into the air, though less greenhouse gasses than captured during the growth of the biomass.[citation needed] Commercial-scale systems process agricultural waste, paper byproducts, and even municipal waste and typically eliminate these side effects by capturing and using the liquid and gas products.[10][11] The 2018 winner of the X Prize Foundation for atmospheric water generators harvests potable water from the drying stage of the gasification process.[12][13] The production of biochar as an output is not a priority in most cases.[citation needed]