Biodegradation

Reduction in the concentration of harmful chemicals by the action of animals and plants.
This category is also used for natural attenuation (harmful chemicals).
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Linking geology and health sciences to assess childhood lead poisoning from artisanal gold mining in Nigeria

Approximately 400 young children have died and thousands more are affected. This study clarifies lead sources and exposure pathways, identifies other toxicants of concern and people at risk, and examines potential for similar lead poisoning globally.