That is as true of the depletion of deep aquifers (whose water is withdrawn for mostly highly inefficient crop irrigation) and deforestation in wet tropics (the harbors of the biosphere’s greatest species diversity) as it is of the globally excessive soil erosion that is, slowly but steadily, diminishing the productive capacity of crop fields; as true of the continuing losses of biodiversity (be it due to deforestation, spreading urbanization, or demand for traditional medicines) as it is of a multifaceted assault on the oceans that ranges from overfishing at the top of the marine food chain
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