Efforts to reduce mining impacts in South America through direct lithium extraction have sparked debate over water use.
Mining companies are showcasing new technologies to extract lithium from salt flats with lower environmental impacts.
Experts warn that the technology may not be ready for large-scale deployment.
The "lithium triangle" in Argentina, Bolivia, and Chile holds over half of the world's known lithium reserves, found in salty brine beneath the region's salt flats.
Author's summary: Lithium extraction faces scrutiny over water use and environmental impacts.