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Supertopics:
Food-Growing Problems
Soil (Dirt)
Agribusiness Depleting Land Resources
Reasons that Food Yields Are Declining

Soil Degradation (Peak Soil)

Subtopics:
Topsoil Erosion / Depletion
Plant Nutrient Defficiencies
Trees Preventing Erosion
planting legumes to counter soil erosion
webAlex WhitingReuters
a third of arable land has been lost in 40 years
webOliver MilmanThe Guardian2015-12-02
an overview of soil erosion
webChris RhodesEnergy Balance Blog2014-05-30
preserving the soil in your garden
webThe Guardian2014-04-04
no-till cover-crop famer David Brandt
webTom PhilpottMother Jones2013-09-09
the roots of soil health (conservation agriculture) (pdf)
webFrancis Shaxson, Amir KassamUN Food and Agriculture Organi...2008-07-01
vertical hillside planting can reduce erosion
webDeborah K. RichSan Francisco Chronicle2006-05-13
Toxic Chemicals in Soil and Plants
Particular Soil Toxic Chemicals
Pesticides as Toxic Chemicals
Farmland Contamination
Soil Testing and Remediation
garden hoses leach lead and plasticizers
webBlair SandersonCBC News2014-06-02
Soil Degradation Miscellany
agrochemicals undermine intrinsic soil fertility
webKristin OhlsonOrion Magazine2016-04-14
petrochemicals are junk food for crops
webAnne Biklé & David R. Montgome...Nautilus2016-03-31
debating the soil quality of the southern Gill Tract
conquest of the land over 7000 years
webW. C. LowdermilkUSDA