Peak Phosphorus: Opportunity in the Making

The report examines the global challenge of 'peak phosphorus,' where the depletion of easily mined rock phosphate reserves threatens global food security. It highlights the Lake Winnipeg Basin as a critical example of phosphorus mismanagement, where agricultural runoff has led to extreme eutrophication. The authors advocate for a transition from mineral fertilizer dependency to a circular phosphorus economy through wastewater recovery (e.g., struvite technology), composting, and improved agricultural practices like no-till farming.

• Peak phosphorus is the point when demand for rock phosphate exceeds supply. While estimates vary, some researchers suggest world extraction could peak as early as 2030, and the United States reached peak production in the late 1980s.
• Global rock phosphate reserves are highly concentrated, with nearly 90% of the 18 billion tonnes of reserves in 2007 located in China, Morocco/Western Sahara, South Africa, and the United States.
• Lake Winnipeg is described as the most eutrophic large lake in the world, characterized by massive blue-green algae blooms visible from space. This is driven by its large watershed—nearly 40 times the lake's surface area—and non-point phosphorus emissions from agriculture.
• Phosphorus recovery from wastewater using struvite technology (magnesium-ammonium-phosphorus precipitate) is a promising solution. It is estimated that converting all Canadian wastewater treatment plants to biological treatment systems with struvite recovery could meet roughly 30% of Canada's fertilizer consumption.
• Significant phosphorus loss occurs through food waste, with approximately 40% of all food wasted worldwide. Recovering phosphorus from food waste and human waste (via composting toilets and urine collection) could reduce dependence on mineral fertilizers.

APA

Ulrich, A., Malley, D., & Voora, V. (2009). Peak Phosphorus: Opportunity in the Making. International Institute for Sustainable Development. https://www.iisd.org/system/files/publications/peak_phosphorus.pdf

Chicago

Ulrich, Andrea, Diane Malley, and Vivek Voora. Peak Phosphorus: Opportunity in the Making. International Institute for Sustainable Development, 2009. https://www.iisd.org/system/files/publications/peak_phosphorus.pdf.

Wikipedia

{{cite report |last1=Ulrich |first1=Andrea |last2=Malley |first2=Diane |last3=Voora |first3=Vivek |title=Peak Phosphorus: Opportunity in the Making |publisher=International Institute for Sustainable Development |date=December 2009 |url=https://www.iisd.org/system/files/publications/peak_phosphorus.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{ulrich2009peak, author = {Ulrich, Andrea and Malley, Diane and Voora, Vivek}, title = {{Peak Phosphorus: Opportunity in the Making}}, institution = {International Institute for Sustainable Development}, year = {2009}, month = dec, url = {https://www.iisd.org/system/files/publications/peak_phosphorus.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }