Take cobalt. Each electric vehicle needs between five to ten kilograms of the bluish-white metal for its lithium-ion batteries. The authors consider cobalt a “metal of most concern for supply risks,” because nearly 60 percent of its production takes place in the Democratic Republic of Congo, a country with a dismal record of child labor and human rights abuses. Should the world’s transportation and electricity sectors ever switch to running entirely on renewables, demand for the metal would soar to more than four times the amount available in reserves, according to the researchers.
https://grist.org/article/report-going-100-renewable-power-means-a-lot-of-dirty-mining/?
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