<<It's just a thought - but given the predicted rise in urban
temperatures resultant of global warming, and the very different
attitude that one encounters to shade trees in warmer climes, maybe we
need to be revising our attitude to trees that provide shade for
buildings. Certainly we can't afford to wait until temperatures have
risen before we change our approach because only large canopy mature
trees make a significant beneficial difference and we can't produce them
over night.>>
Rodney Helliwell's paper in the Arboricultural Journal (2008, Vol. 30 pp
279-287) 'Trees, Daylight and Buildings' is worth a look
Glyn
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