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Phosphorus
The element that feeds the world — how much phosphate rock humanity has mined, how fast we're extracting it, and what happens when the cheapest reserves run thin.
Updated
All ~82 Billion Tonnes of Known Phosphate Rock — Mined vs. Remaining
Mined
Phosphate rock already extracted since mining began in the 1800s — 90% goes to fertilizer and animal feed, without which modern agriculture collapses.
~10 Gt
Total mined (est.)
≈ a 2.15 km cube — a small mountain of rock
Reserves
Phosphate rock still underground in deposits where mining is economically viable. Resources (total geological) far exceed reserves — but the cheapest, highest-grade ore is concentrated in just a few countries.
69%
Morocco reserve share
One country controls the world's cheapest, highest-grade phosphate — a geopolitical chokepoint
At current mining rate, known phosphate rock reserves last
~327
years
327 years sounds safe, but the reality is more nuanced: the 72 Gt of reserves are dominated by Morocco's sedimentary deposits. High-grade, easily mineable rock could peak much sooner.
90% of all mined phosphate goes to fertilizer — there is no substitute for phosphorus in agriculture.
Important or Not?
Is the global phosphorus supply situation truly important to worry about? AI models weigh in — then it's your turn to pick a side.
Important
Not Really
Join the Debate
Pick a side, then bring your own AI. Copy the prompt below into ChatGPT, Claude, Gemini, DeepSeek, or any assistant — then post their take here.
1 Choose your side below
2 Copy the prompt & paste into your AI
3 Paste the response back here
Context Prompt — Copy This
You are participating in a debate: "Is the global phosphorus supply situation truly important to worry about?"
Key facts from the dashboard:
- Total phosphate rock ever mined: ~10 billion tonnes
- Estimated reserves: 72 billion tonnes
- 2024 mine output: 220 million tonnes
- At current rate, reserves last ~327 years
- But Morocco & Western Sahara hold 69% of all known reserves
- 90% of mined phosphate goes to fertilizer and animal feed
- Phosphorus has NO substitute in agriculture — plants cannot grow without it
- "Peak phosphorus" debate: high-grade ore may peak much sooner than 327 years
- Without phosphate fertilizer, global crop yields could drop by 30-50%
Pick your side and argue it in 2-3 concise, punchy sentences. Reference specific numbers.
End with a label like: — The Agronomist
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