"Peak ozone levels have come down since the 1990s, but we haven't had the gains we expected on ozone, " said Dr Erika von Schneidemesser from the Institute for Advanced Sustainability Studies, Potsdam, Germany.

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Stefan Rahmsdorf, a professor of oceanography at Potsdam University in Germany, says that sea levels were basically flat for most of the past 2000 years, but in the past 100 have increased faster than ever before.

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His book is the first to chronicle the entire story of the division of Germany, from Potsdam to unification.

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Analysts at the Potsdam Institute for Climate Impacts Research in Germany said a rise of at least 3C (5.4F) by 2100 was likely.

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Germany cannot do all this on its own, argues Ottmar Edenhofer of the Potsdam Institute for Climate Impact Research.

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