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“THE world was warmer last year than at any time since records began,” led a story by Fred Pearce in the edition of Â鶹´«Ã½. It was also the warmest year in an already record-breaking decade, and the “greenhouse effect” was beginning to get public attention. But the extent of humanity’s contribution to this was still unclear. “Whether the current warming is due to the greenhouse effect from man-made pollution remains open,” we reported.

NASA scientist Jim Hansen (pictured) was sure that humans were to blame. In 1988, he caused an international stir, we reported, when…