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The oceans were less cold in the early 20th century (1900–1930) than previously thought. During this period the ocean appears too cold due to the way some measurements were taken. However, the new findings do not affect the quantification of the global warming relative to 1850-1900 and the human contribution to that warming, stress climate researchers around Sebastian Sippel (Leipzig University) and Reto Knutti from ETH Zurich.