Peru fighting mining pollution with little green algae

Scientists in Peru have removed small green algae from polluted lakes and rivers in a bid to strengthen them with nutrients and oxygen before returning them to purify those water bodies from harmful mining waste.

Dry soil to absorb some snowmelt heading to Colorado River

Storms brought deep snow to the mountains that feed the vital Colorado River this winter and spring, but the dried-out landscape will soak up some of the runoff before it can reach the river and the 40 million people depending ...

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