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Studies of ancient beaches and fossilised coral reefs suggest sea levels have the potential to rise far more quickly than models currently predict, according to geologists who have been studying past periods of warming.
At one point in a comparable period they were rising at three metres per century, or 30mm a year, according to Dr Fiona Hibbert, a geologist at York University in the UK. The current rate of rise is 3.2mm per year.
Dr Hibbert is working on a project called ExTaSea, which predicts worst-case scenarios for sea level rise around the globe. The goal is to help policymakers take long-term decisions, for example about the siting of enduring infrastructure such as nuclear power stations.