The link is graphite, a vital component in batteries used in Tesla’s Model S, Toyota’s plug-in Prius and other electric cars, as well as in electronic gadgets including iPhones. It’s mostly mined and processed in China where graphite pollution has fouled air and water, damaged crops and raised health concerns. Link
If you really want to push it, someone can say that the pollution problems are caused by the tech companies from elsewhere but another person could also say that it is the users who demand for these products that indirectly caused the pollution issues. It’s a vicious cycle.