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… of tons per year,64 causing siltation of water bodies,65 acid mine drainage, and leaching of toxic minerals. This … >0.04 — 0.05 >0.05 Not significant Sahel (150-700mm/year precipitation isohyets) UNCCD | Global Land Outlook | Chapter … ammonium, continuous harvesting of nitrogen fixing crops), acid deposition from fossil fuels and mine drainage. …