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The article discusses the origin of thermostat in the North Atlantic Ocean. The paleoceanographers assumed that thermostat switch which began to melt the world over the last ice age lay somewhere in the North Atlantic Ocean. However, new evidence from the tropical places that it lay in the waters around Antarctica. According to a paleoceanographer Lowell Stott, studying the origin of it comes down to timing, and determining the timing of climate events can be tough as warming in the tropics is recorded in marine sediments, whereas warming in Antarctica is recorded in glacial ice.

Reports research which showed that coral from the western North Atlantic reflected climate changes in deep currents at the end of the last Ice Age. Methods of paleoceanographers; Research by Adkins et al in this issue; Value of coral as an archive; Details on research; Impact of climate on ocean circulation; Carbon-14 levels in coral; Insights into the rates of ancient ocean circulation.