> Oh really?  Now why is tree shade cooler than man made shade?
 >  Or is that
 > "Cooler" not a reference to temperature?  ;-)
 
And now, part two:
 
My physicist husband reminds me that since trees respirate, they are natural 
evaporative coolers.  They put out moisture, and the moisture evaporates, so 
it cools the air.
 
I still think there is an extra cooling effect because tree branches don't 
block the breeze as much as a solid man-made shade; this allows our own human 
evaporative cooling more chance to work. ;-)
 
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