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Supertopics:
Topsoil Erosion / Depletion
The Ecology of Trees
Trees Preventing Erosion
Subtopics:
deforestation releases mercury via erosion
web
Jayme Poisson and David Bruser
The Star
2016-09-14
trees reviving farmland in Niger
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Lydia Polgreen
New York Times
2007-02-11