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Parts of the county will be under water within 75 years unless drastic action is taken to cut carbon emissons, according to the World Development Movement (WDM).
A sea-level projection map, which WDM says is based on the latest science, shows the Isle of Sheppey and Sheerness are most at risk of being sunk completely by 2080.
Most of the Hoo peninsula, including the Kingsnorth power station site, will also be covered.
Other areas at risk: