Direct lithium extraction is being promoted as a way to reduce mining impacts in South America.
Mining companies are developing new technologies to extract lithium from the region's 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.
Scientists warn that the new technology could worsen the depletion of scarce freshwater resources in the region.
Author's summary: Lithium extraction faces scrutiny over water use and environmental impacts.