From Karl Erik Birkeland
Reading about Japanese attempts to bring down summer temperatures by pumping water out of Tokyo’s metro system and spraying it over the city’s roads, I started to wonder if the engineers behind the project have considered the risks of such a practice (13 August, p 30). The method would seem to be vulnerable to both accidental growth of pathogenic bacteria such as legionella and deliberate contamination performed by terrorists.
Sortland, Norway
