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The article makes no mention of the warming predating the industrial revolution. Rather, the quote below indicates a marked change in temperature at the beginning of the 20th century.

When we looked at the whole 800-year timescale, our temperature and salinity records look pretty constant,” said co-lead author Dr Tesi Tommaso from the Institute of Polar Sciences of the National Research Council in Bologna. “But all of a sudden at the start of the 20th century, you get this marked change in temperature and salinity – it really sticks out.