Biochar From Human Waste Could Solve Global Fertilizer Shortages, Study Finds (theguardian.com)
(Tuesday August 12, 2025 @11:20AM (msmash)
from the how-about-that dept.)
Biochar produced from solid human excrement could [1]supply up to 7% of global phosphorus fertilizer needs annually , according to a Cornell University study [2]published in PNAS . When combined with nutrients extracted from urine, the process could provide 15% of phosphorus, 17% of nitrogen, and 25% of potassium used in agriculture worldwide.
The biochar production process reduces solid waste volume and weight by up to 90%, while allowing nutrient proportions to be adjusted for specific crop requirements.
[1] https://www.theguardian.com/science/2025/aug/11/biochar-from-human-waste-could-solve-global-fertiliser-shortages-study-finds
[2] https://www.pnas.org/cgi/doi/10.1073/pnas.2503668122
The biochar production process reduces solid waste volume and weight by up to 90%, while allowing nutrient proportions to be adjusted for specific crop requirements.
[1] https://www.theguardian.com/science/2025/aug/11/biochar-from-human-waste-could-solve-global-fertiliser-shortages-study-finds
[2] https://www.pnas.org/cgi/doi/10.1073/pnas.2503668122