Globe and Mail: A short drive from the windswept North Sea coast of England, the Climatic Research Unit occupies a squat, weather-beaten grey concrete building on the campus of the University of East Anglia. This scientific bunker holds the world’s largest trove of climate-change data, gleaned from Siberian tree-ring counts, Greenland ice-layer measurements and centuries-old thermometer readings. Now the pirating of thousands of e-mail messages from within its walls has revealed a dangerous …