An undated photo courtesy of Nasa showing the Thwaites glacier in western Antarctica. This tipping point for Antarctica could be triggered by a global temperature rise of 3C above the preindustrial era. Photograph: AFP/Getty Images
An undated photo courtesy of Nasa showing the Thwaites glacier in western Antarctica. This tipping point for Antarctica could be triggered by a global temperature rise of 3C above the preindustrial era. Photograph: AFP/Getty Images
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