Scientists Say Urine Fertilizer Could Help Feed the Planet and Cut Emissions

Researchers from the Institute of Environmental Science and Technology at the Universitat Autònoma de Barcelona (ICTA-UAB) have discovered a new, surprisingly simple way to reduce agricultural emissions: by turning human urine into fertilizer. As reported in SciTechDaily, this “yellow water” solution could dramatically reduce carbon emissions, cut water waste, and help cities grow their own food more sustainably.

The research team led by the Sostenipra group and GENOCOV group developed a pilot project inside a bioclimatic building at ICTA-UAB. Male urinals without water were connected to a storage and treatment system underground. There, urine was stabilized and converted into nitrate—a plant-friendly form of nitrogen. The nutrient-rich liquid was then used to grow tomatoes in a rooftop greenhouse.

According to the study, one cubic meter of urine can generate enough nitrogen to grow 2.4 tons of tomatoes outdoors. That’s a massive boost for local agriculture, especially as the world’s demand for synthetic nitrogen-based fertilizers keeps climbing—by over a million tons every year, according to the FAO.

Synthetic fertilizers, usually made from fossil fuels, generate huge amounts of greenhouse gases and often pollute waterways. Replacing them with nutrient-rich human waste could close the loop on urban agriculture and reduce our reliance on dirty, extractive industries. Plus, it puts something often considered waste to genuinely good use.

While researchers are still studying things like leftover pharmaceuticals in urine, the environmental upside is clear.

This breakthrough might seem a little unconventional, but it’s a powerful reminder that the future of sustainability could be hiding in plain sight—even in the bathroom.

If you’re excited about clean food and a greener future, Support circular farming, reduce your meat intake, go vegan, and speak up for smarter urban agriculture systems. Every drop counts.

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