Are these a good thing, re global warming?
I was in Italy recently, and they seem to be fashionable there.
But I haven't seen many in Dublin, where I live.

Any recommendations on make, installation, etc?

--
Timothy Murphy
e-mail (80k only): tim /at/ birdsnest.maths.tcd.ie
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland