Climate change to blame for acid rock drainage in certain parts of the world

Copper, zinc, and sulphate concentrations in the waters of Colorado mountain streams affected by acid rock drainage have roughly doubled over the past 30 years, a, notes that natural chemical weathering of bedrock is the source of the rising acidity and metals, but the ultimate driver of the trend is climate change.

“The key point is no recent mining or remediation work has been done,” Manning said. “These watersheds have just been sitting there responding to nothing other than the climate.” In the scientist’s view, to help mitigate the water quality risk, managers could benefit from advanced knowledge of what metals are entering the stream and where and how fast they are increasing.

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