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I took a palaeoclimatology course with Kristen St. John, who became my undergraduate research adviser.

Throughout, discussion of past overfishing or earlier climate change—“palaeoclimatology”—hangs heavy with the question of the impact on human society both of overfishing and of global warming.

Whereas palaeoclimatology measures tree-rings and stalactites and deposition patterns in sediment, historical climatologists scour the of ships, and the diaries of amateur naturalists for clues.