A small industrial town observes a decline in local biodiversity, especially among amphibians living near factories. Monitoring data show elevated levels of heavy metals and organic solvents in nearby ponds. Which main cause best explains this environmental issue?

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Natural weathering of local bedrock releasing trace elements

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Enhanced groundwater recharge from urban green spaces

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Increased use of synthetic fertilizers on distant croplands

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Discharge of untreated industrial effluents into surface waters

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A small industrial town observes a decline in local biodiversity, especially amo...

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