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What I'm trying to say eventually, as I need to go to sleep, is that all engineering is to some extent dirty. Some is more, some is less, but all produces some kind of harmful waste. PV may contaminate ground with cobalt, wind turbines with gearbox oil etc etc.
At the end of the day we must always deal with that waste. We know how to do it in environmentally safe way, which is why we know both arsenic and radioactive waste is safe there.