Of course the planet has been warmer before, for example in the Eemian (when Hippopotamuses roamed England and when sea levels were 5-7m higher), however civilisation, agriculture and our infratructure developed during the Holocene, a period of remarkable climatic stability. To quote Jim Hansen, writing in the Philosophical Journals of the Royal Society
You don't really have an answer to that one.
But it isn't just the Swiss glaciers, the ice cores in Greenland and in Antarctica, and glaciers elsewhere exhibit similar variation, just check the literature it's all in there.
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