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Is Antarctica’s warming natural or man-made?

Guardian: Most people know that the Antarctic Peninsula is one of the most rapidly warming places on earth. But like everywhere else in Antarctica, the length of available temperature data is short - most records begin in 1957 (when stations were put in place during the International Geophysical Year); a few start in the late 1940s. This makes the recent rapid warming difficult to evaluate; in general, what's interesting is how the trend compares with the underlying variability. As anyone who's been there...