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I've just read through the article: what do you see as 'dirty' about the salars? The fact that workers wear masks?

Like any mining operation you have to move a lot of earth use a lot of energy and dig up large regions.

The processing of the slurry to get the lithium after it's mined. All that water needed in a very arid region.

It was in contrast to lithium being easily recyclable compared to the vast scale of mining it.