Hi Brad,
I should of course have said "allow" rather than "put".
You don't mention the _real_ reason why people want to put them in green
spaces, which is that they get large subsidies for feed-in, rather than
having to manage the land that's lost to agriculture or wildlife.
I can see cost being an issue where they're over car parks and the like;
access and safety perhaps(!) on high roofs.
_But_ the real-estate for those places exists.  They're not taking
otherwise valuable land out of normal circulation.
For me personally, the access/cost/safety arguments make little sense.
Obviously others will have different views.
-- 
Gordon Scott.    Electronics and software engineering.
        Basingstoke UK
        +44-1256-476547
But for the sake of some little mouthful of flesh 
we deprive a soul of the sun and light, 
and of that proportion of life and time 
it had been born into the world to enjoy. 
=== Plutarch AD44-120
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