In message , John Hall
writes
As we've mentioned before here, It's striking how much sunnier the last
two decades have been, possibly more due to the Clean Air Act than to
climate change.

Very true John, but with the vast majority of 20th century recording
stations being in our expanding urban areas, could rising temperatures a
la Global Warming be as much about increased sunshine, and the urban
heat island ,effect rather than climate change per se?
--
Steve Jackson,
Bablake Weather Station,
Coventry, UK
http://www.bablakeweather.co.uk