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Supertopics:
Reasons that Food Yields Are Declining
Food-Growing Problems
Soil (Dirt)
Agribusiness Depleting Land Resources
Soil Degradation (Peak Soil)
Subtopics:
Topsoil Erosion / Depletion
Toxic Chemicals in Soil and Plants
Soil and Water Salinization (Salinity, Salt)
Desertification
Soil Degradation Miscellany