There's mercury in the Amazon. This scientist is tracking it down.

 Gold mining using mercury has caused severe environmental damage to the waterways of Peru’s Madre de Dios region. However, National Geographic Explorer and geologist Jennifer Angel-Amaya is determined to restore them. She is working to develop solutions that will help further protect the Amazon and ensure mercury-free gold becomes the standard. Rolex and the National Geographic Society are partnering on science-based expeditions to explore, study, and document change in the planet’s unique regions

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