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Solar project to destroy thousands of Joshua trees in the Mojave Desert
(ca.news.yahoo.com)
This is a most excellent place for technology news and articles.
I've never seen it. In my area, they're all roof or ground mount, not suspended above parking lots.
Take a look at solarenergymaps.com Definitely not comprehensive though, I know of a couple in my area that are missing.
And even in places where it is happening, it is still extremely rare for a parking lot to have solar panels. Legislation is needed.