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Una squadra di ricercatori, tra cui un bernese, ha identificato nella calotta glaciale dell'Antartide delle zone in cui il ghiaccio potrebbe risalire fino a 1,5 milioni di anni fa.
Lo si legge in un comunicato dell'Unione europea di geoscienze, i cui risultati sono stati pubblicati anche sulla rivista Climate of the Past.
I campioni più vecchi finora trovati permettevano di risalire "solo" fino a 800'000 anni fa. La nuova scoperta consentirebbe dunque di far luce su un periodo anteriore molto importante e misterioso della storia climatica del nostro pianeta.
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