I will try not to be sarcastic...
Solar energy's darker side stirs concern - from the LA Times.
Electronics in general is not very clean because of the materials used. But, of course, most things when you get into the details have challenges. Even something as simple as a dairy farm has an environmental impact. This article brings up the issue what do you do with the solar panels end of life? Recycling is going to be interesting... And then there is the manufacturing process that is usually never brought up.
Solar, or the semiconductor based on, is semiconductors. This deals with exotic metals that are put on with super thin coatings that are etched. Etching means some type of acid, and what do you do with all the stuff you just etched off. Yes, semiconductors are not very clean, and they have contaminated a lot of the water in silicon valley.
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