His vineyard lies along the eighth latitude south of the equator.

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They announced preliminary findings in March but now have good data confirming large amounts of the water-ice just beneath the surface south of 60 degrees latitude.

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In reply, Dr Toepfer said analysis of whaling records and modelling studies showed that Antarctic sea ice had retreated south by 2.8 degrees of latitude between the mid 1950s and the early 1970s.

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