Chapotraphouse

Losing cities to the sea actually will help the economy, funny enough. It's destruction of fixed capital and will cause intense demand for replacement housing and amenities. This will increase the rate of profit and stall its fall, as well as create a short-term stimulus in spending. Hell, if climate change wreaks enough havoc on infrastructure the capitalists won't even need to go into World War every time they have a profit crisis - nature will do the destruction for them.