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World’s highways could host 52.3 billion solar panels, say researchers
(www.pv-magazine.com)
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I mean. That's dirt cheap in the grand scheme of things.
In comparison to extinction? Yes. In comparison to every other green option including other implementions of solar? No.
Not really, embedded panels crack constantly and need replacement.
Lifted panels get covered in dust and oil and basically need constant cleaning, plus they get stolen at an alarming rate.