The subject of global warming seems to be rarely out of the news these
days, with even George Bush - known to critics as the "Toxic
Texan" - talking of "the serious challenge of global climate
change" in his recent State of the Union address. One of many studies
on the issue is currently being prepared by Professor Sid Redner of Boston
University, who has been using data on record temperatures from Prague's
Clementinum weather station. I asked him why.