re: Tesla's gigafactory is a cool idea but not really sustainable

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Furthermore, are these materials only produced in those countries because they literally do not exist anywhere else

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Elements exist everywhere, you can find gold in seawater.

They are produced in those countries because that's where the deposits are concentrated in levels that make it worthwhile for mining.

I just don't see mass electric cars being feasible with today's technology. A slight increase in % of elec cars would lead to millions of tons of new raw materials needed that naturally only exist at 20 ppm levels. Then you have to consider the demand that would place on the power grids and plants.

We need new technology. I am hoping something can be done with aluminum considering how abundant it is.